HIIT or hi-intensity interval training (HIIT) is one of the most effective calorie-torching workouts out there. In a nutshell, HIIT will have you working hard for a short period of time, resting for a slightly longer period, then repeating the process. This workout is all about quality, not quantity and the short length intervals allow you to push yourself even harder. Here, … [Read more...] about 7 Must-Know Reasons Why HIIT Works