Bicycle Crunch
Bicycle Crunch Exercise Description
The bicycle crunch is a bodyweight trunk-flexion-with-rotation exercise that primarily targets the rectus abdominis and the external and internal obliques. Alternating leg motion adds a coordination challenge and increases the demand for lumbopelvic control so the lower back stays in gentle contact with the floor. The movement is driven by rotating the ribcage to bring the opposite shoulder toward the bent knee while the other leg extends, keeping the elbows wide and the neck neutral. Proper execution emphasizes abdominal engagement over hip flexor dominance by maintaining a slight posterior pelvic tilt and lifting the shoulder blades off the floor. This variation trains controlled spinal flexion and rotation while resisting lumbar extension as the legs move.
- Muscle Groups: Abs, Core, Waist
- Target Muscles: Rectus Abdominis
- Assisting Muscles: External Obliques, Internal Obliques
- Stabilizing Muscles: Multifidus, Quadratus Lumborum, Transversus Abdominis
- Body Area: Upper Body
- Body Parts: Core, Torso
- Body Surface: Front
- Body Symmetry: Unilateral
- Equipment: Bodyweight
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Trunk Flexors
- Joint Involvement: Multi-joint
- Muscle Location: Stomach
- Movement Direction: Rotational
- Muscle Position: Anterior
- Gender: Male
How To Do The Bicycle Crunch Exercise
‘- Lie supine on a mat; fingertips lightly support the sides of your head, elbows wide.
– Set a slight posterior pelvic tilt so the lower back gently contacts the floor.
– Lift knees to tabletop (hips and knees ~90°) and raise shoulder blades off the floor; keep a neutral neck and steady gaze.
– Initiate from the ribcage: rotate right shoulder toward left knee as you extend the right leg to about 30–45°.
– Keep elbows wide; avoid pulling on your head or neck.
– Switch sides smoothly through center while keeping shoulder blades elevated and low back anchored.
– Reach the extending leg long without letting the pelvis tip or the low back arch.
– Use a controlled tempo; prioritize rotation of the torso over touching elbow to knee.
– Breathe rhythmically—exhale during each rotation, inhale through the transition.
– To finish, lower shoulder blades first, then bring feet down with control.
Bicycle Crunch Tips
‘- Maintain a slight posterior pelvic tilt so your lower back gently contacts the floor.
– Keep fingertips lightly on the sides of your head with elbows wide; avoid pulling on your head or neck.
– Lift knees to tabletop (hips and knees about 90°) before starting the rotations.
– Initiate each rep by rotating the ribcage to bring the opposite shoulder toward the bent knee, not by leading with the elbow.
– Keep your shoulder blades lifted off the floor and your low back anchored as you alternate sides.
– Extend the moving leg to about 30–45°, reaching it long without letting the pelvis tip or the low back arch.
– Use a controlled tempo and prioritize rotating the torso over trying to touch your elbow to your knee.
– Maintain a neutral neck and steady gaze throughout the movement.
– Breathe rhythmically—exhale during each rotation and inhale through the transition.
– To finish, lower your shoulder blades to the floor first, then bring your feet down with control.
Bicycle Crunch Beginner Introduction
The bicycle crunch is a bodyweight core exercise performed lying on the back, blending a twisting motion through the torso with a smooth, cycling movement of the legs. As the upper body curls and turns so one shoulder travels across toward a bent leg, the opposite leg stretches out, creating a continuous, rhythmic pattern. This coordinated action places strong emphasis on the abs and side abs while the neck, head, and elbows remain relaxed and open rather than pulling or straining.
Because the legs are moving while the trunk stays lifted, the exercise places special demands on control through the hips and lower back, encouraging gentle, consistent contact with the mat instead of letting the spine arch. The movement highlights precise, deliberate rotation of the ribcage rather than simply trying to touch elbow to knee, promoting careful alignment and smooth transitions from side to side. Steady breathing supports this flowing motion, helping the core stay active and stable throughout each repetition.