Reverse Crunch
Reverse Crunch Exercise Description
The reverse crunch is a bodyweight abdominal exercise that trains spinal flexion initiated from the pelvis. It emphasizes the rectus abdominis by using posterior pelvic tilt to curl the tailbone off the floor, with the transverse abdominis and external obliques assisting in trunk stabilization. Compared with leg-lowering variations, the bent‑knee position shortens the lever arm to reduce hip flexor dominance when performed with strict pelvic control. The goal is a small, controlled lift of the sacrum rather than swinging the legs or yanking with momentum. Proper execution reinforces bracing, ribcage control, and a neutral cervical position while protecting the lumbar spine through controlled movement.
- Muscle Groups: Abs, Core, Waist
- Target Muscles: Rectus Abdominis
- Assisting Muscles: Internal Obliques
- Stabilizing Muscles: External Obliques, Transversus Abdominis
- Body Area: Upper Body
- Body Parts: Core, Torso
- Body Surface: Front
- Body Symmetry: Other
- Equipment: Bodyweight
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Trunk Flexors
- Joint Involvement: Single-joint
- Muscle Location: Stomach
- Movement Direction: Vertical
- Muscle Position: Anterior
- Gender: Male
How To Do The Reverse Crunch Exercise
‘- Lie supine with arms at your sides, palms down. Keep head and neck neutral, eyes to the ceiling.
– Lift feet so hips and knees are each bent about 90 degrees; shins parallel to the floor.
– Gently brace the abdominal wall and flatten the low back to the floor to set a posterior pelvic tilt.
– Exhale and curl the pelvis toward the ribcage, lifting the tailbone a few centimeters. Keep shoulders and upper back on the floor.
– Maintain roughly 90 degrees at the knees; avoid kicking or swinging the legs.
– Pause briefly at the top with ribs down and abdominal tension; do not press with the hands.
– Inhale and lower the pelvis back to the start under control, returning to the initial posterior tilt before the next repetition.
– Throughout, keep the neck relaxed, avoid arching the low back, and move only through a comfortable, controlled range.
Reverse Crunch Tips
‘- Start with hips and knees bent about 90 degrees and shins parallel to the floor.
– Gently brace your abdominal wall and flatten your low back to the floor before starting each rep.
– Initiate the movement by curling the pelvis toward the ribcage to lift the tailbone only a few centimeters.
– Keep shoulders and upper back on the floor as the pelvis curls.
– Maintain roughly 90 degrees at the knees and avoid kicking or swinging the legs.
– Pause briefly at the top with ribs down and abdominal tension, without pressing with the hands.
– Lower the pelvis back to the start under control, returning to the initial posterior pelvic tilt before the next rep.
– Keep your head and neck neutral with eyes to the ceiling, and relax the neck throughout.
– Avoid arching the low back and move only through a comfortable, controlled range.
Reverse Crunch Beginner Introduction
The reverse crunch is a floor-based core exercise that relies only on bodyweight and centers on controlled movement from the hips and lower spine. In this variation, the emphasis stays on the abs by bending the knees and bringing the legs into a compact position, which reduces the workload on the hip flexors. As the hips roll toward the ribcage and the tailbone gently lifts from the surface, the abs take the primary role, with the deep abs and side abs helping to steady the torso.
Throughout the motion, the upper back and shoulders remain in contact with the floor, encouraging the mid‑section to work without help from swinging legs or arm momentum. The neck rests in a natural position with the gaze upward, supporting a calm, steady posture. Because the movement is small and deliberate, it highlights tension and control in the core instead of large, fast leg actions, offering a focused way to train the front of the body while paying attention to comfort in the lower back.