The Plank Jack exercise works your shoulders, abs, butt, hamstrings and calves.
[MUSIC]. Hi. We're gonna do jumping jack planks. Your hands are a little wider than shoulder width apart. Legs are nice and strong. You're on the balls of your feet, jump out like this. Keep your **** nice and tight, your legs are strong. Jump back in. Let's do 10 together. One, two, three, four, five, six, seven, eight, nine, ten. Good, notice that I didn't move my upper body back and forth. You keep it nice and still.
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