Holding a static plank is great for you core, but adding a jumping jack motion with your feet pushes this move to a whole new level. The plank jack is a great cardio move; it raises the heart rate while working both your lower and upper body.
- 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 a total of 30 jumping jacks, which counts as one set. Then complete two more sets.
Source: POPSUGAR Studios