Name the quickest, most-effective way to burn calories, build muscle endurance, and change your body composition (i.e. convert body fat into lean muscle mass) and you’re likely to here the same four letters roll off most of their tongues: HIIT.
The acronym stands for high-intensity interval training. The premise of this type of workout is to give your all (this means performing at a 9 or 10 out of 10 in terms of effort) for short amounts of time. Intervals are typically one minute long and broken up into 20 or 30 seconds of work, followed by 40 or 30 seconds of recovery.