This workout is the jumpstart you need
Ever feel like you're showing up, doing the work… …but your progress is stalled out? Here’s why that happens, and how to jumpstart that progress in less than 20 minutes. As you get fitter and your body adapts, the same workouts that used to feel challenging eventually stop sending the signal your body needs to change to keep up. That’s where a strategy called peripheral heart action training (PHA) comes in. (Don’t worry, the name sounds more technical than it is.)


