Do you even know what HIIT stands for? We have the answer to that—and more.

Circuit training involves quickly rotating through a series of exercises targeting different areas of the body. You can do it at the gym, at home, or during an exercise class. Share on Pinterest Getty ...

Directions: Warm up for a few minutes with dynamic stretches and some light cardio such as jump roping or lateral shuffles. The workout is broken up into three circuits, all of which have three ...