Also known as: hollow rock, hollow rocks, hollow hold rock, lying hollow rock, hollow position rock

What is Hollow Body Rock?

The Hollow Body Rock is a calisthenics core exercise where you hold a hollow position and gently rock back and forth to build midline control. It primarily targets the abdominals, deep core stabilizers, and glutes. Difficulty: Medium - appropriate for trainees with basic core strength and body tension.

How to Do Hollow Body Rock

  1. Assume hollow position: Lie on your back, extend arms overhead and legs straight; lift shoulders and heels off the floor while tucking the pelvis and engaging glutes.
  2. Engage the core: Flatten your lower back to the floor by bracing the abs and drawing the ribs down; maintain total body tension throughout the movement.
  3. Initiate the rock: Slightly flex at the hips and rock legs down toward the floor while allowing your upper back to roll onto the mat with control.
  4. Control the return: Use core tension to rock back to the starting hollow position without arching the lower back; limit range if you lose form.
  5. Breathe and repeat: Maintain steady breathing, aim for smooth rhythmic rocks for time or reps, and stop if you feel spinal discomfort or loss of tension.

Muscle Groups

Core, Glutes

Description

Get into the Hollow Body position. Arms extended overhead, shoulder and upper back are off the floor, core shortened. Legs are straight, feet elevated, and glutes engaged. Maintain total body tension.

Initiate the rock by slightly bending the hips and then rocking your legs down towards the floor. Rock onto your upper back, maintaining a rigid hollow position, and continue rocking back and forth, breathing throughout the movement. Repeat for time.
Movement Group: Core
Equipment: None (bodyweight only)

Progressions and Regressions

None

Frequently Asked Questions

What are the main benefits of the Hollow Body Rock?

Hollow Body Rocks improve midline stability, core endurance, and body tension while strengthening the abdominals and glutes. They transfer well to other calisthenics skills and help develop control for dynamic core movements.

What common mistakes should I avoid when doing Hollow Body Rocks?

Avoid letting the lower back arch, flaring the ribs, or using momentum from the neck and shoulders. Keep glutes engaged and a tight core; reduce range if form breaks down.

How can I progress or regress this exercise?

Regress by tucking knees or holding a static hollow hold. Progress by increasing time under tension, straightening legs fully, adding slow pulses, or combining with leg lowers for added challenge.