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New to High-Intensity Interval Training? This No-Equipment Workout Is Only 20 Minutes
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Plank Jacks

  • Begin in the plank position with your shoulders over your wrists, your body in one straight line, and your feet together.
  • Like the motion of jumping jacks, jump your legs wide apart and then back together to complete a rep.
  • To make this move easier, jump slowly or alternately step each foot out to the side then back to the center.
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