Bicycle Crunch

Definition

The bicycle crunch is a core-pattern bodyweight exercise that combines a crunch with a twisting motion and alternating leg drive, mimicking a pedalling action. It targets the rectus abdominis and obliques simultaneously, making it one of the most efficient core exercises for HYROX^® athletes who need rotational stability and trunk strength.

Technique & Form

1. Starting position: Lie on your back with hands lightly behind your head (not pulling the neck). Lift your shoulders off the floor and raise both feet, knees bent at 90 degrees.
2. Twist and drive: Rotate your torso to bring your right elbow toward your left knee while extending your right leg straight. The movement comes from the torso, not the arms.
3. Alternate: Switch sides in a controlled, rhythmic motion - left elbow to right knee, right leg extends. The movement resembles pedalling a bicycle.
4. Maintain elevation: Keep your shoulders off the floor throughout the set. Lower back stays pressed into the ground.
5. Breathing: Exhale on each twist, inhale between sides. Perform 3 sets of 20-30 reps (10-15 per side).

Muscles Worked

• Primary movers: Rectus abdominis, internal and external obliques
• Secondary: Hip flexors (iliopsoas), transverse abdominis
• Stabilizers: Lower back, quadriceps

Common Mistakes

1. Pulling the neck: Hands support the head - they do not pull it forward. If your neck hurts, you are pulling.
2. Moving too fast: Slow, controlled rotations produce better oblique activation. Rushing reduces effectiveness.
3. Dropping the extended leg too low: Keep the straight leg at 30-45 degrees from the floor to maintain core tension.

Benefits

The bicycle crunch targets both the rectus abdominis and obliques in a single dynamic movement, building the rotational core strength and anti-rotation control that supports running, sled work, and loaded carries in HYROX^®.

HYROX^® Context

Core rotational strength and stability support running efficiency (torso anti-rotation during the gait cycle), Sled Push and Pull (trunk stability under load), and Farmers Carry (anti-lateral flexion). The bicycle crunch is an excellent high-rep core finisher. Programme 3 sets of 20-30 total reps as part of a core circuit.

Variations & Alternatives

• Crunch - Standard crunch for rectus abdominis isolation.
• Dead Bug - Anti-extension core exercise for spinal stability.
• Barbell Walking Lunge - Loaded movement requiring strong core bracing.

FAQ

How many bicycle crunches should I do? 3 sets of 20-30 reps (10-15 per side). Focus on slow, controlled rotations rather than speed.

Are bicycle crunches better than regular crunches? They are more comprehensive because they target the obliques in addition to the rectus abdominis. Use both in your core training.

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