- Begin in plank position, with your shoulders over your wrists, your body in one straight line, and your feet together.
- Like the motion of a jumping jack, jump your legs wide and then back together. Jump as quickly as you want, but keep your pelvis steady and don't let your booty rise toward the ceiling.
- Do as many reps as you can, maintaining good form, in 30 seconds. Build up to doing this move for an entire minute.
This is a full-body cardio move and keeping your core stable as you jump your legs apart and together requires serious ab work.