Start in a modified push up position with your feet together and hands wider than shoulders at about chest level. Keep a straight line from shoulder to ankle.
Quickly hop your feet as far apart as you can while simultaneously hopping your hands as far above your head as you can control.
Quickly hop your legs back together again at the same time hopping your hands back down to chest level, still keeping them as wide as you can.
Continue hopping your feet and hands out and back for a set number of repetitions or a set time limit before dropping out of the push up position. Hopping your feet and hands out and back in is one repetition.
Push Up Jacks incorporate the motion of a jumping jack with the motion of a push up to create a particularly sadistic and very difficult core/total body exercise. With the number of muscles involved in this move, these burn calories at a very high rate and extensively challenge your muscle and cardiovascular endurance. Because of this, these are great to add to a fat burning workout or a Boot Camp routine - but only for the most advanced exerciser.