What is Plank Jacks?

Plank Jacks are an Easy dynamic plank exercise that combines core stabilization with low-impact cardio-style leg jumps. It primarily targets the core, shoulders, and upper back while improving shoulder stability and hip mobility. Suitable for beginners when performed with controlled tempo and strict plank alignment.

How to Do Plank Jacks

  1. Forearm plank setup: Begin on hands and knees, lower forearms under shoulders with elbows aligned, hands shoulder-width apart, and step both feet back into a straight line.
  2. Align your body: Keep a neutral spine from heels to head, gaze slightly ahead, hips level, and avoid sagging or piking to protect lower back and shoulders.
  3. Brace the core: Tighten your abdominal muscles and glutes to create a rigid plank, exhaling to maintain tension and prevent lumbar collapse during movement.
  4. Perform plank jacks: Quickly jump feet wide then back together while holding the plank—land softly on the balls of your feet and keep hips stable.
  5. Modify if needed: Lower intensity by stepping feet out and in instead of jumping, or raise hands to a high plank to reduce shoulder strain.

Muscle Groups

Core, Shoulders, Back

Description

Start on the floor on your hands and knees. Lower your forearms to the floor with elbows positioned under your shoulders and your hands shoulder-width apart.

If someone looked at you from the side, your arms would form a 90-degree angle. Step your feet back, one at a time.

Maintain a straight line from heels through the top of your head, looking down at the floor, with gaze slightly in front of your face.

Now, tighten your abs and hold. While holding plank, jump of with your legs into a wider stance and then back.
Movement Group: Core
Equipment: None (bodyweight only)

Progressions and Regressions

None

Frequently Asked Questions

What are the benefits of Plank Jacks?

Plank Jacks build core strength and shoulder stability while raising heart rate for light cardio. They improve hip mobility, coordination, and endurance in a time-efficient, equipment-free way suitable for circuit workouts and warm-ups.

What common mistakes should I avoid when doing Plank Jacks?

Avoid letting hips sag or pike, which strains the lower back. Don't flail arms or collapse shoulders; keep elbows under shoulders, core braced, and controlled foot movement. Excessive speed with poor form reduces benefits and increases injury risk.

How can I progress or modify Plank Jacks?

Progress by increasing tempo, duration, or adding a resistance band around ankles. For low-impact options, step feet out and in, perform high-plank jacks from hands, or try mountain climbers and lateral plank walks as alternatives.