The 12-3-30 Workout: Does the Viral Incline Treadmill Walk Actually Work?
12-3-30 is 30 minutes at 3 mph on a 12% incline. The incline turns an easy walk into a ~8-MET vigorous workout burning roughly 250–350 calories. Here's the science, who it's for, and the one mistake that quietly deletes half the benefit.
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