Plank Jack
A high-intensity core exercise that combines a static plank hold with the dynamic leg movement of a jumping jack. This movement elevates your heart rate for cardiovascular conditioning while demanding significant core stability and shoulder strength.
Because Plank Jacks require both cardiovascular endurance and core stability, form often degrades as fatigue sets in. The AI analyzes your heart rate variability (HRV) and recent sleep data to gauge your readiness for high-impact intervals, while real-time performance tracking ensures you maintain intensity without compromising your lower back safety due to exhaustion.
Form Cues
- Start in a high plank position with wrists directly under shoulders
- Brace your core tightly to keep your hips level
- Jump both feet out and in lightly, landing on the balls of your feet
- Maintain a straight line from your head to your heels throughout
- Breathe rhythmically with the movement
- Don't let your hips sag toward the floor
- Don't pike your hips high into the air
- Don't bounce your upper body excessively
- Don't drop your head or look back at your feet
Common Mistakes
- Sagging hips (lumbar extension)
- Piking hips up excessively
- Heavy landing on feet
- Shoulders drifting behind wrists
- Holding breath
Muscles Worked
This exercise primarily targets the core stabilizers, including the rectus abdominis and obliques, which must work overtime to prevent the spine from moving during the leg jumps. It also heavily utilizes the anterior deltoids and triceps for upper body stability, while the hip abductors and flexors drive the dynamic lower body movement.
Primary
Secondary
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