The 12-3-30 Workout: Does the Viral Incline Treadmill Walk Actually Work?

The short answer: Yes, 12-3-30 works as a repeatable cardio session. Two lab studies have now tested it directly. At the University of Nevada, Las Vegas, 14 active adults walking hands-free burned about 308 calories in 30 minutes.¹ In an ACE-funded study of 17 inactive adults, effort averaged 47% of heart-rate reserve, with a wide range.²

The UNLV walkers matched the calories of a self-paced run that took 24 minutes.¹

So the workout is real exercise. How hard it is for you depends on your fitness, your bodyweight, your treadmill and whether you hold the rails.

12-3-30 at a glance

12-3-30 means 12% incline, 3 mph and 30 minutes on a treadmill. In metric that is 4.8 km/h for 30 minutes, covering 1.5 miles (2.4 km) and climbing about 290 m (950 ft). The ACSM walking equation puts it at about 8.3 METs, and a 155 lb person burns roughly 280–305 calories, depending on the estimate.

12-3-30	Value	Source
Incline	12% grade	The protocol
Speed	3.0 mph = 4.8 km/h (80 m/min)	Unit conversion
Duration	30 minutes	The protocol
Distance	1.5 miles = 2.41 km	Speed × time
Vertical gain	About 290 m (950 ft)	Distance × 12% grade
Steps	About 3,400 (level-ground cadence)	113.6 steps/min at 3.0 mph3
Estimated intensity	~8.3 METs (28.9 mL/kg/min)	ACSM walking equation4
Measured calories	~308 kcal (UNLV, 75 kg avg); ~221 kcal (ACE, 67 kg avg)	Lab studies12
Handrails	Hands-free; gripping lowers the demand	UNLV protocol; Porcari study15

What is the 12-3-30 workout?

12-3-30 is a treadmill incline walk: 12% incline, 3 mph, 30 minutes. YouTuber Lauren Giraldo devised it by trial and error around 2019, using her gym treadmill’s top incline. It was not designed in a lab, but the incline principle underneath it is well studied.

Giraldo landed on the numbers by feel: 12 was her treadmill’s highest incline, 3 mph felt brisk but doable, and 30 minutes was a daily movement target.⁶⁷ She posted it, and it spread across social media. She has also said it took time to get there: “I definitely had to work up to 30 minutes.”⁷

That origin matters for one reason. The numbers are arbitrary. There’s nothing special about 12, 3 or 30. What makes the session work is the incline, and that part is backed by physiology.

What does the research say about 12-3-30?

Two studies have tested 12-3-30 directly. UNLV found it burned the same calories as a self-paced run, at a lower rate per minute and with a higher share of fat. A Western Colorado study funded by ACE found an average of 47% of heart-rate reserve, with individuals ranging from light to vigorous.

Study	Who	What they found
Wong, Navalta et al., UNLV, Int J Exerc Sci 20251	16 regularly active adults enrolled (avg 75 kg), 14 analysed; handrails, phones and setting changes not allowed	307.6 kcal in 30.1 min (10.2 kcal/min) vs 309.7 kcal in 23.9 min of self-paced running (13.1 kcal/min). Fat supplied 40.6% of energy vs 33.1% for running.
Pelino, Diaz, Dalleck, Western Colorado University, Int J Res Ex Phys 2024, ACE-funded28	17 inactive adults, avg 67 kg, VO2max 45.1 mL/kg/min	Heart rate 124 bpm (range 83–151); 47.4% of heart-rate reserve (16.1–70.6%); 220.8 kcal per workout (154–321); post-workout feeling scores positive for everyone (+2 to +4)
Sato, Lankford et al., Int J Exerc Sci 20249	22 adults aged 19–31; 20% grade walk vs level jog, calorie-matched	No difference in oxygen use (24.11 vs 24.25 mL/kg/min), calories, heart rate or effort rating. Jogging was enjoyed more.
Krieger, Lankford et al., Int J Exerc Sci 202510	19 inactive adults; 20% grade walk vs level jog, calorie-matched	Jogging produced higher foot and lower-back accelerations. The authors call the steep walk “a lower-impact, yet equally demanding, alternative”.

The ACE study’s lead researcher, exercise physiologist Lance Dalleck, PhD, of Western Colorado University, put it plainly: “If done repeatedly, this workout will improve and maintain cardiorespiratory fitness… And, the energy expenditure is pretty meaningful.”⁸

Two caveats. Both 12-3-30 studies measured a single session, not weeks of training. And the ACE study reported 5.5 METs on a personal scale, dividing exercise oxygen use by each participant’s own measured resting rate rather than the standard 3.5 mL/kg/min, so that figure can’t be compared directly with the 8.3 METs the equation gives.²

Why does a 12% incline make walking so much harder?

On an incline you lift your body against gravity with every step, and you recruit more of your glutes, hamstrings and calves. Stanford researchers measured the metabolic cost of walking at a 10% incline at 113% above level walking, more than double.

Walking on a steep grade is not a slightly harder version of flat walking. It is a different intensity category.

• You’re raising your body with every step. Stanford researchers Amy Silder, Thor Besier and Scott Delp found that metabolic cost rose 52% above level walking at a 5% incline and 113% at a 10% incline.¹¹ The extra work is the mechanical work of lifting your center of mass, which is absent on flat ground.
• You recruit more muscle. Rodger Kram’s biomechanics lab at the University of Colorado Boulder measured leg-muscle activation across grades and speeds. Uphill walking sharply increased activation of the glutes, hamstrings and calves.¹² That is why 12-3-30 leaves your posterior chain, not just your lungs, feeling the work.

The American College of Sports Medicine (ACSM) walking equation turns grade into an oxygen cost: VO2 = 0.1 × speed + 1.8 × speed × grade + 3.5, with speed in metres per minute and grade as a decimal.⁴ Each incline step at 3 mph adds a predictable amount:

Incline at 3 mph	Estimated METs (ACSM equation)	Oxygen demand (mL/kg/min)
0%	3.3	11.5
4%	5.0	17.3
6%	5.8	20.2
8%	6.6	23.1
10%	7.4	26.0
12%	8.3	28.9
15%	9.5	33.3

Treat these as planning numbers, not measurements. In a lab test of 20 adults walking slowly up grades of 0–27%, the equation’s average predictions fell within 3 mL/kg/min of measured values at every grade.¹³ A study of 200 college students at about 3 mph on 2–6% grades found the equations “not a good predictor” of individual results.¹⁴

How many calories does 12-3-30 burn?

About 236 calories at 120 lb, 305 at 155 lb and 394 at 200 lb, by the ACSM equation (gross, including resting energy). Measured results fall in the same range: 308 kcal in the UNLV study and 221 kcal in the ACE study. Your number depends mostly on bodyweight.

Bodyweight	ACSM gross kcal (30 min)	ACSM net kcal (above resting)	2011 Compendium kcal (8.0 METs)
120 lb (54 kg)	236	208	218
140 lb (64 kg)	276	242	254
155 lb (70 kg)	305	268	281
180 lb (82 kg)	354	311	327
200 lb (91 kg)	394	346	363
220 lb (100 kg)	433	381	399
250 lb (113 kg)	492	433	454

The gross and net columns use the ACSM equation’s 28.9 mL/kg/min and 5 kcal per litre of oxygen. The Compendium column uses the 2011 Compendium’s 8.0 METs for “walking, 2.9 to 3.5 mph, uphill, 6% to 15% grade”.¹⁵ The 2024 Compendium dropped that code; its nearest entry, climbing hills with no load at an 11–20% grade, is 8.8 METs.¹⁶

Two things move the real number. Measured burn varies widely between people: in the ACE study it ran from 154 to 321 kcal.² And your watch or treadmill estimate can be off. Our guide to wearable calorie-burn accuracy covers how far. Treat any figure as an estimate, not a food budget.

Is 12-3-30 better than running?

Not better, but different. In the UNLV study, 12-3-30 and a self-paced run burned the same calories, but the run got there in 24 minutes and the walk took 30. The walk drew a higher share of its energy from fat and, in a separate study, put less impact through the body.

Here is how 30 minutes of 12-3-30 compares with other common cardio, using the 2024 Adult Compendium of Physical Activities. Calories are gross, for a 155 lb person.

30 minutes of…	Compendium code and MET	Calories at 155 lb
Walking, treadmill, 3.0–3.4 mph, 0% grade	17355 · 3.8 METs	134
Elliptical trainer, moderate effort	02048 · 5.0 METs	176
Stationary bike, 90–100 watts	01220 · 6.0 METs	211
Climbing hills, 21–40 lb load, 3–10% grade (rucking)	17050 · 7.5 METs	264
12-3-30 (ACSM equation)	~8.3 METs	~290–305
Climbing hills, no load, 11–20% grade	17036 · 8.8 METs	309
Running, 5.0–5.2 mph (12 min/mile)	12030 · 8.5 METs	299
Running, 6.0–6.3 mph (10 min/mile)	12050 · 9.3 METs	327
Stair treadmill (StairMaster), general	02065 · 9.3 METs	327

Sources: Compendium codes and METs from Herrmann et al. 2024.¹⁶ Calories are MET × bodyweight in kg × hours.

So 12-3-30 sits in running territory for total energy, at a walking pace. The UNLV team measured it head-to-head: 10.2 kcal per minute for 12-3-30 against 13.1 for running, with fat supplying 40.6% of the walk’s energy and 33.1% of the run’s.¹ A higher fat share doesn’t mean more fat loss; total energy expenditure and your overall diet drive that.

Impact is the other difference. In the Krieger study, calorie-matched steep walking produced lower foot and lower-back accelerations than level jogging.¹⁰ If running hurts or you dislike it, 12-3-30 gives you a similar energy cost with less pounding. If you like running, it does the job in less time. Our rucking guide covers the loaded-walk option.

12-3-30 vs 10,000 steps: how many steps is it?

About 3,400 steps. At 3 mph on level ground, adults aged 21–40 averaged 113.6 steps per minute, so 30 minutes is roughly 3,400 steps, about a third of 10,000. The incline makes each of those steps far more costly than ordinary walking.

That estimate comes from the CADENCE-Adults study, which measured cadence on level ground.³ We found no study measuring cadence at a 12% incline, so treat 3,400 as approximate.

Steps still matter. Harvard epidemiologist I-Min Lee found mortality benefits starting at about 4,400 steps a day in older women, levelling off near 7,500.¹⁷ A pooled analysis of 15 international cohorts in The Lancet Public Health found risk kept falling up to roughly 6,000–8,000 steps a day in adults 60 and older and 8,000–10,000 in younger adults.¹⁸

The difference is intensity. A 10,000-step day spread out at an easy pace is mostly light activity. 12-3-30 packs about a third of those steps into 30 minutes at roughly 8 METs, which counts toward the guidelines’ moderate-to-vigorous minutes. Doing both is better than either. Our walking for weight loss guide covers daily step targets.

What heart rate zone is 12-3-30?

It depends on your fitness. In the ACE study, heart rate averaged 124 bpm but ranged from 83 to 151, between 16% and 71% of heart-rate reserve. So it can feel like easy Zone 2 for a fit person and Zone 4 within minutes for a beginner.

Everyone in that study used the same speed, incline and duration, and their bodies responded very differently.² The settings do not set your zone. Your fitness does.

That’s why “just do 12-3-30” is incomplete advice without a way to see where you land. A heart-rate reading from your watch, your breathing and how the effort feels all help. If you want to understand the zones and how to calibrate them, start with our Zone 2 training guide.

One nuance on fat burning. Peak fat oxidation per minute occurs at a moderate intensity, around 64% of VO2max, as Asker Jeukendrup’s group at the University of Birmingham showed with its “Fatmax” work.¹⁹ Push harder and you burn more total calories, with a smaller fraction from fat. For weight loss that barely matters, but it’s why 12-3-30 and easy flat walks do different jobs.

Does holding the handrails ruin 12-3-30?

It lowers the workout’s demand. In a University of Wisconsin–La Crosse treadmill study co-authored by John Porcari, PhD, gripping the rails cut oxygen uptake by roughly 15–21% versus free arm swing. If you can’t let go, lower the incline or speed.

When you hold on, part of your bodyweight goes through your arms while the belt keeps moving. Porcari’s group measured this in 10 adults aged 38–60, at three stages set at 75%, 85% and 95% of each person’s ventilatory-threshold workload.⁵ It wasn’t a 12-3-30 test, but it shows why support changes the dose.

The UNLV study banned handrails entirely, and the researchers noted that Giraldo has said she alternates, holding about 30% of the time.¹ So the 308 calories measured there are a hands-free figure.

Cleveland Clinic exercise physiologist Katie Lawton, MEd, gives the practical rule: “If you feel like you need to hang on, you probably should consider changing the incline or speed.”²⁰ Use the rails for a quick balance check, then let go. An easier setting walked hands-free beats a steeper one you’re hanging off.

What results can you expect from 12-3-30 in a month?

No study has measured 12-3-30 over weeks, so any “results in 30 days” claim is extrapolation. What the evidence supports: four sessions a week is two hours of moderate-to-vigorous activity, and a 155 lb person spends about 4,300 calories above resting over a month.

Here’s the arithmetic for four weeks at four sessions a week:

155 lb person, 4 sessions a week	Per session	Per week	Per 4 weeks
Minutes	30	120	480
Net calories (ACSM, above resting)	~268	~1,070	~4,290
Share of the 150-minute weekly guideline	20%	80%	—

US guidelines call for 150–300 minutes of moderate activity, 75–150 minutes of vigorous activity, or an equivalent mix each week.²¹ Count each session from your actual effort, not by assuming it’s always vigorous.

Whether those calories turn into weight loss depends on what you eat. People often eat back some of what they burn, so the scale will move less than the arithmetic suggests. Fitness gains are more reliable: Dalleck’s view is that repeated sessions “will improve and maintain cardiorespiratory fitness.”⁸

The biggest predictor of results is whether you keep going. Exercise psychologist Panteleimon Ekkekakis has spent two decades showing that people feel worse during exercise above their ventilatory threshold, and that how a workout feels predicts whether they come back.²² Incline walking helps here: everyone in the ACE study rated it as pleasant, with a median of +4 on a scale from −5 to +5.² It feels more approachable than running, and you can watch a show.

How do you build up to 12-3-30?

Start flat and add incline over about three weeks. Sports medicine physician Dennis Cardone, DO, of NYU Langone advises “First, tolerate flat,” then raising the incline in steps of four so you reach 12 over about three weeks. Keep 3 mph or less, and walk hands-free.

Cardone suggests going “at 4-degree intervals” over a three-week period to reach 12.⁷ On a treadmill those are percentage steps. A plan built on that advice:

Week	Incline	Speed	Time	Sessions
0 (if new to walking)	0–2%	2.5–3.0 mph	20–30 min	3
1	4%	2.5–3.0 mph	20–30 min	2–3
2	8%	2.5–3.0 mph	20–30 min	2–3
3	12%	2.5–3.0 mph	20–30 min	3
4	12%	3.0 mph	30 min	3–4

1. Warm up 3–5 minutes at a flat, easy pace. A proper warm-up matters more on an incline, where your calves and Achilles take load from the first step.
2. Build duration before incline. Hold a setting until 30 minutes feels manageable.
3. Stay hands-free. If you need the rails, drop back a stage.
4. Cool down 3–5 minutes flat and easy.

A no-gadget intensity check is cadence. About 100 steps per minute marks moderate intensity for most adults on level ground.²³ On an incline you reach vigorous intensity at a lower cadence, so let your breathing and heart rate lead.

If your treadmill tops out below 12%, lower the incline and add time, or pick up the pace slightly. The equation table above shows what each setting is worth. Without a treadmill, a steady hill walk does the same job.

Who should skip or modify 12-3-30?

Modify it if a steep, sustained incline aggravates your lower back, hamstrings, Achilles tendons, knees or plantar fascia, the areas Dr. Cardone flags. It is lower impact than running but not load-free, and it doesn’t replace strength training. If pain changes your form, stop and drop the incline.

Those five areas are the injuries Cardone names for people who ramp up too fast.⁷ A 12% grade increases the work done by your calves, Achilles tendons, glutes and hamstrings.¹¹¹² If pain, balance or your form changes, stop and drop the incline.

Incline can be kinder to some joints. In a study of 12 adults with obesity, Ehlen and colleagues found that walking slowly at a 6° incline (about a 10.5% grade) reduced peak knee extension and adduction moments by about 19% and 26% compared with fast level walking.²⁴ For people with knee pain, a slower, steeper walk may be easier on the knees than a faster flat one.

Two things 12-3-30 can’t do:

• Replace resistance training. It works your posterior chain more than flat walking, but it gives no progressive loading or full movement coverage. If body composition is the goal, pair cardio with lifting and enough protein. Our body recomposition guide shows how the pieces fit together.
• Keep raising your aerobic ceiling forever. Less-trained people improve quickly. Fitter people eventually need faster, longer or interval work. Our HIIT vs. Zone 2 breakdown covers how to split the week.

How can SensAI fit 12-3-30 into your training week?

SensAI reads your workouts from Apple Health, so a 12-3-30 walk recorded on an Apple Watch or any device that writes to Apple Health appears in SensAI’s Activity tab. The Coach then plans the rest of your week around it.

SensAI doesn’t connect to Garmin, Oura or WHOOP directly. Each device’s own app writes workouts, heart rate and sleep into Apple Health on your iPhone, and SensAI reads them from there.²⁵ Apple Watch needs no setup, and it is the only device that shares HRV with SensAI.²⁵ To set it up or check that your data is flowing, follow our Help Center guide to connecting a wearable to SensAI through Apple Health.

Once your walks are in Apple Health, the SensAI Coach sees them on the same timeline as your strength sessions when it builds next week’s program, and sleep and overnight heart rate from your device shape how hard it asks you to push on a given day.²⁵ SensAI won’t tell you 12-3-30 is magic. It treats the walk as what it is: real cardio load that your lifting has to fit around.

Frequently asked questions

What does 12-3-30 mean? A treadmill walk at a 12% incline and 3 mph for 30 minutes. It covers 1.5 miles (2.4 km) and climbs about 290 m (950 ft).

How many calories does 12-3-30 (12 incline, 3 speed, 30 minutes) burn? About 236 at 120 lb, 305 at 155 lb and 394 at 200 lb by the ACSM equation. Lab studies measured about 308 calories (UNLV, 75 kg average) and 221 calories (ACE, 67 kg average).¹²

Does 12-3-30 burn fat? It uses energy and can contribute to fat loss within a calorie deficit. In the UNLV study fat supplied 40.6% of the walk’s energy, against 33.1% for running.¹ Total calories and diet matter more than that share.

Is 12-3-30 better than running? For the same calories, running is quicker and the walk is lower impact. In the UNLV study both burned about 308 calories; the run took 24 minutes.¹

What is 12-3-30 in km? 12% incline at 4.8 km/h for 30 minutes, covering 2.41 km.

How many steps is 12-3-30? About 3,400, based on a level-ground cadence of 113.6 steps per minute at 3 mph.³ That’s about a third of a 10,000-step (10k) day.

What is 12 incline on a treadmill? A 12% grade: the belt rises 12 units for every 100 travelled, about 6.8 degrees, not 12 degrees. At 3 mph the ACSM equation puts it at about 8.3 METs.⁴

What are the benefits of the 12-3-30 treadmill workout? Running-level energy cost at a walking pace,¹ lower impact than jogging,¹⁰ more glute, hamstring and calf work than flat walking,¹² positive feeling scores from every participant in the ACE study,² and 30 minutes toward the 150-minute weekly guideline.²¹

Is 12-3-30 better than 10k steps? They do different jobs. 12-3-30 is about 3,400 steps at roughly 8 METs, which counts as moderate-to-vigorous exercise; a 10k-step day is mostly light activity spread over hours. Doing both beats either alone.³¹⁸

Is 12-3-30 good for beginners? The idea is, but the full setting often isn’t. Start flat, add incline in steps of about 4% over three weeks, and walk hands-free.⁷

How many days a week should I do it? Start with 2–3 and build to 3–4. Four 30-minute sessions is 120 minutes, which covers 80% of the 150-minute moderate guideline.²¹

Can I do 12-3-30 every day? Some people do, but give your calves and Achilles time to adapt first, and keep room for strength training and easier days.

Is holding the handrails really that bad? It lowers the demand. In one 10-person study, gripping the rails cut oxygen uptake by about 15–21%.⁵ If you need continuous support, lower the incline or speed.

Can I lose weight with just 12-3-30? It helps, but weight loss is driven by diet and total activity. A 155 lb person doing four sessions a week spends about 4,300 calories above resting in a month; how much of that shows on the scale depends on what you eat.

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References

Footnotes

1. Wong MWH, Davis DW, Perez OR, Weyers B, Green DM, Garcia AV, Navalta JW. “An Exploratory Study Comparing the Metabolic Responses between the 12-3-30 Treadmill Workout and Self-Paced Treadmill Running.” International Journal of Exercise Science, 2025;18(6):56-64. https://pubmed.ncbi.nlm.nih.gov/39917588/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹

2. Pelino LM, Diaz J, Dalleck LC. “Physiological Responses of the 12-3-30 Workout: Exercise Myth or Reality.” International Journal of Research in Exercise Physiology, 2024;20(1):12-23. https://ijrep.org/physiological-responses-of-the-12-3-30-workout-exercise-myth-or-reality/ ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹

3. Tudor-Locke C et al. “Walking cadence (steps/min) and intensity in 21-40 year olds: CADENCE-adults.” International Journal of Behavioral Nutrition and Physical Activity, 2019;16:8. https://pubmed.ncbi.nlm.nih.gov/30654810/ ↩ ↩² ↩³ ↩⁴

4. Weyand PG, Ludlow LW, Nollkamper JJ, Buller MJ. “Real-world walking economy: can laboratory equations predict field energy expenditure?” Journal of Applied Physiology, 2021;131(4):1272-1285. https://pubmed.ncbi.nlm.nih.gov/34410843/ ↩ ↩² ↩³

5. Berling J, Foster C, Gibson M, Doberstein S, Porcari J. “The Effect of Handrail Support on Oxygen Uptake during Steady-State Treadmill Exercise.” Journal of Cardiopulmonary Rehabilitation, 2006. https://pubmed.ncbi.nlm.nih.gov/17135860/ ↩ ↩² ↩³

6. Good Morning America. “What to know about the TikTok-famous ‘12-3-30’ treadmill workout.” January 3, 2025 (first published January 4, 2023). https://www.goodmorningamerica.com/wellness/story/tiktok-famous-12-30-treadmill-workout-82600185 ↩

7. Steinhilber B. TODAY. “What Is 12-3-30? People Are Losing Weight With This Walking Treadmill Workout.” Updated June 30, 2025. https://www.today.com/health/diet-fitness/12-3-30-workout-rcna155871 ↩ ↩² ↩³ ↩⁴ ↩⁵

8. Pelino L, Diaz J, Dalleck L, with Green DJ. “ACE-Supported Research: The 12-3-30 Workout: Putting a Viral Workout to the Test.” ACE Certified, March 2025. https://contentcdn.eacefitness.com/March2025/12-3-30_Workout.pdf ↩ ↩² ↩³

9. Sato M, Krieger T, Gidley AD, Weaver B, Johnson CA, Lankford DE. “Physiological and Psychological Differences Between 20% Grade Incline Walking and Level-Grade Jogging at Isocaloric Intensity.” International Journal of Exercise Science, 2024;17(6):1318-1336. https://pubmed.ncbi.nlm.nih.gov/39807288/ ↩

10. Krieger T, Sato M, Gidley L, Ortega J, Lankford DE. “Accelerations and EMG Differences Between Isocaloric High-Incline Walking and Level-Grade Jogging.” International Journal of Exercise Science, 2025;18(7):995-1009. https://pubmed.ncbi.nlm.nih.gov/41079262/ ↩ ↩² ↩³

11. Silder A, Besier T, Delp SL. “Predicting the Metabolic Cost of Incline Walking from Muscle Activity and Walking Mechanics.” Journal of Biomechanics, 2012. https://pubmed.ncbi.nlm.nih.gov/22578744/ ↩ ↩²

12. Franz JR, Kram R. “The Effects of Grade and Speed on Leg Muscle Activations during Walking.” Gait & Posture, 2012. https://pubmed.ncbi.nlm.nih.gov/21962846/ ↩ ↩² ↩³

13. Dalleck LC, Vella CA, Kravitz L, Robergs RA. “The Accuracy of the American College of Sports Medicine Metabolic Equation for Walking at Altitude and Higher-Grade Conditions.” Journal of Strength and Conditioning Research, 2005;19(3):534-537. https://pubmed.ncbi.nlm.nih.gov/16095415/ ↩

14. Stoedefalke K, Hawkins MA. “The accuracy of the ACSM prediction equations, for determining walking caloric expenditure, in college-aged males and females.” Journal of American College Health, 2022;70(1):130-133. https://pubmed.ncbi.nlm.nih.gov/32150498/ ↩

15. Ainsworth BE et al. “2011 Compendium of Physical Activities: A Second Update of Codes and MET Values.” Medicine & Science in Sports & Exercise, 2011. https://pubmed.ncbi.nlm.nih.gov/21681120/ ↩

16. Herrmann SD, Willis EA, Ainsworth BE, Barreira TV, Hastert M, et al. “2024 Adult Compendium of Physical Activities: A third update of the energy costs of human activities.” Journal of Sport and Health Science, 2024;13(1):6-12. https://pubmed.ncbi.nlm.nih.gov/38242596/ ↩ ↩²

17. Lee I-Min et al. “Association of Step Volume and Intensity with All-Cause Mortality in Older Women.” JAMA Internal Medicine, 2019. https://pubmed.ncbi.nlm.nih.gov/31141585/ ↩

18. Paluch AE et al. “Daily Steps and All-Cause Mortality: A Meta-Analysis of 15 International Cohorts.” The Lancet Public Health, 2022. https://pubmed.ncbi.nlm.nih.gov/35247352/ ↩ ↩²

19. Achten J, Gleeson M, Jeukendrup AE. “Determination of the Exercise Intensity That Elicits Maximal Fat Oxidation.” Medicine & Science in Sports & Exercise, 2002. https://pubmed.ncbi.nlm.nih.gov/11782653/ ↩

20. Cleveland Clinic Health Essentials. “What Is the 12-3-30 Workout? And Does It Work?” December 30, 2021. https://health.clevelandclinic.org/12-3-30-workout ↩

21. Piercy KL et al. “The Physical Activity Guidelines for Americans.” JAMA, 2018. https://pubmed.ncbi.nlm.nih.gov/30418471/ ↩ ↩² ↩³

22. Ekkekakis P, Parfitt G, Petruzzello SJ. “The Pleasure and Displeasure People Feel When They Exercise at Different Intensities: Decennial Update and Progress towards a Tripartite Rationale for Exercise Intensity Prescription.” Sports Medicine, 2011. https://pubmed.ncbi.nlm.nih.gov/21780850/ ↩

23. Tudor-Locke C et al. “How Fast Is Fast Enough? Walking Cadence (Steps/Min) as a Practical Estimate of Intensity in Adults: A Narrative Review.” British Journal of Sports Medicine, 2018. https://pubmed.ncbi.nlm.nih.gov/29858465/ ↩

24. Ehlen KA, Reiser RF 2nd, Browning RC. “Energetics and Biomechanics of Inclined Treadmill Walking in Obese Adults.” Medicine & Science in Sports & Exercise, 2011;43(7):1251-1259. https://pubmed.ncbi.nlm.nih.gov/21200344/ ↩

25. SensAI Help Center. “How to Connect Garmin, Oura, WHOOP, Strava, or Any Wearable to SensAI Through Apple Health.” Last updated September 25, 2026. https://www.sensai.fit/help/connect-wearable-to-sensai-apple-health ↩ ↩² ↩³