Hollow Rock
Hollow Rock Exercise Description
The Hollow Rock is a gymnastics-inspired core exercise that trains rigid body-line control while resisting lumbar extension. You maintain a strong posterior pelvic tilt and “hollow” shape as the body rocks smoothly like a single unit. Primary musculature includes the rectus abdominis, external and internal obliques, transverse abdominis, and the hip flexors (notably iliopsoas and rectus femoris); the shoulders remain flexed overhead, requiring active reach and stable rib position. The goal is to keep the lower back in continuous contact with the floor, preventing arching or segmental bending at the hips, knees, or shoulders. Expect a small, controlled rocking amplitude driven by whole-body tension, not momentum. This drill reinforces efficient core bracing, posterior pelvic control, and body-line tension common to many bodyweight skills.
- Muscle Groups: Abs, Core, Hips, Waist
- Target Muscles: Psoas Major, Rectus Abdominis
- Assisting Muscles: External Obliques, Iliacus, Internal Obliques, Rectus Femoris, Transversus Abdominis
- Stabilizing Muscles: Deltoid - Anterior, Serratus Anterior
- Body Area: Lower Body, Upper Body
- Body Parts: Core, Hips, Legs, Torso, Upper Legs
- Body Surface: Front
- Body Symmetry: Bilateral
- Equipment: Bodyweight
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Hip Flexors, Trunk Flexors
- Joint Involvement: Other
- Muscle Location: Hip Flexor, Stomach
- Movement Direction: Other
- Muscle Position: Anterior
- Gender: Male
How To Do The Hollow Rock Exercise
‘- Lie supine with legs together and extended; arms straight overhead with biceps by the ears.
– Posteriorly tilt the pelvis to flatten the lower back into the floor; draw ribs down and brace the abdominal wall.
– Lift shoulder blades and heels a few inches off the floor, keeping the neck neutral and gaze upward.
– Squeeze legs together, fully extend knees, and point or actively reach through the toes.
– Reach long through the fingertips overhead without letting the ribs flare; keep arms straight.
– Initiate a small rock by shifting weight slightly from upper back to glutes while keeping the body rigid.
– Maintain continuous lower-back contact with the floor; do not let the lumbar spine arch.
– Keep the rock smooth and quiet—no jerking, no momentum, and no change in hip or knee angle.
– Breathe in short, controlled breaths while maintaining the brace and shape.
– If needed to maintain form, lower difficulty by bringing arms to sides or crossing them on the chest, or by bending the knees into a tuck while keeping the posterior pelvic tilt.
Hollow Rock Tips
‘- Flatten your lower back into the floor with a strong posterior pelvic tilt before you start rocking.
– Keep ribs drawn down and the abdominal wall braced as you move.
– Lift shoulder blades and heels just a few inches off the floor while keeping the neck neutral and gaze upward.
– Squeeze your legs together, fully extend the knees, and actively reach through the toes.
– Reach long through straight arms overhead with biceps by your ears, without letting the ribs flare.
– Initiate only a small rock by gently shifting weight between upper back and glutes while staying rigid.
– Maintain continuous lower-back contact with the floor and do not let the lumbar spine arch.
– Keep the rock smooth and quiet with no jerking, no momentum, and no change in hip or knee angle.
– Use short, controlled breaths so you can keep the brace and hollow shape.
– If you lose form, decrease difficulty by moving arms to your sides or chest, or by bending the knees into a tuck while keeping the posterior pelvic tilt.
Hollow Rock Beginner Introduction
The Hollow Rock is a floor-based, gymnastics-style core drill that emphasizes full-body tension and precise control. The body is arranged in a “hollow” position, with legs long, arms reaching overhead, and the trunk slightly rounded so the midsection stays firmly connected to the ground. From this shape, the body gently rocks as one solid piece, rather than bending at the hips, knees, or shoulders. The movement stays small and deliberate, driven by tight muscular engagement rather than swinging or using speed.
This exercise strongly challenges the abs, deep abs, side abs, and hip flexors, with support from the front of the thighs and the shoulders. The low back remains pressed into the floor, which trains resistance against arching through the spine. Because the arms are extended overhead, the core also works to steady the ribcage and maintain an organized torso position. Overall, this drill highlights bracing, pelvic control, and unified body alignment that carry over to many bodyweight skills.