So I've been adding in with my interval sprints a 5-exercise circuit, which is a great way to optimize your workouts in just 20 minutes, and really boost your metabolism.
3 min warm up on treadmill (walking) - set incline accordingly to your fitness level. I'll often have it between 4-8%.
x1 30-45 seconds all-out sprint (allow for treadmill to speed up before starting countdown). Then leave...
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INTENSE FAT BURNER Interval Sprints & 5-Exercise Circuit