Abs exercise

Plank Jack

How to do the Plank Jack with correct form — the muscles worked, equipment, and step-by-step technique from the Fitonist exercise library.

Start in plank position with your arms extended and hands under your shoulders, feet together. Your body should be in a straight line from your head to your heels. Engage your abs. Jump both feet out wide to each side as if you were doing a horizontal jumping jack. Stay in plank…
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Illustration showing the Plank Jack
Targets

Muscles worked

Abs muscle Abs Primary
Technique

How to do the Plank Jack

  1. 1 Start in plank position with your arms extended and hands under your shoulders, feet together. Your body should be in a straight line from your head to your heels.
  2. 2 Engage your abs. Jump both feet out wide to each side as if you were doing a horizontal jumping jack.
  3. 3 Stay in plank position as you quickly jump your feet back together.
  4. 4 Continue to jump back in and out. Keep your back flat and don’t let your hips drop throughout the entire movement. Your arms should remain steady.