Target area(s): full body (cardio) and legs
How to perform a squat jack:
Start standing with your hands at your side. Begin a regular jumping jack, extending your legs out to the side and arms over your head.
After 2 regular jumping jacks place your hands lightly behind your head (as you would in a crunch), but continue moving your legs.
Lower your upper body so that you are in a semi-squat position. Continue moving your legs in and out, but just in a constant lowered state.
Do the squat jack 20 times, rest for 30 seconds and complete 4 more sets for a total of 100 squat jacks.