Strengthens: Core, upper and lower body (so yeah, you pretty much work everything with this one)
Step 1: Begin in plank position, with your shoulders over your wrists, your body in one straight line, and your feet together.
Step 2: 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.
Step 3: Try to complete this in sets of 30 up to your goal number of repetitions.
Image from www.health.com
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