45 Degree Bicycle Twisting Crunch
45 Degree Bicycle Twisting Crunch Exercise Description
The 45-Degree Bicycle Twisting Crunch is a floor-based trunk flexion with rotation that targets the rectus abdominis and the internal/external obliques. You alternate a diagonal crunch while extending the opposite leg to roughly a 45° angle, increasing the lever challenge for the anterior core. Maintain a gentle posterior pelvic tilt and consistent low-back contact with the mat to emphasize the abdominals and limit lumbar extension. Hands simply support the head; rotation originates from the ribcage and thoracic spine rather than pulling with the arms. The hip flexors assist in holding the legs up, but the focus remains on bracing, controlled rotation, and coordinated limb movement. Use smooth, deliberate reps to keep tension on the trunk and avoid momentum.
- Muscle Groups: Abs, Obliques, Waist
- Target Muscles: External Obliques, Internal Obliques
- Assisting Muscles: Rectus Abdominis
- Stabilizing Muscles: Multifidus, Psoas Major, Rectus Femoris, Transversus Abdominis
- Body Area: Upper Body
- Body Parts: Core
- Body Surface: Side
- Body Symmetry: Unilateral
- Equipment: Bodyweight
- Exercise Patterns: Other
- Exercise Type: Strength
- Functional Grouping: Trunk Lateral Flexors, Trunk Rotators
- Joint Involvement: Multi-joint
- Muscle Location: Deep Side Abs, Side Abs
- Movement Direction: Rotational
- Muscle Position: Lateral
- Gender: Female
How To Do The 45 Degree Bicycle Twisting Crunch Exercise
‘- Lie supine. Hands lightly cradle the base of the skull or touch the sides of the head; elbows stay wide.
– Engage the abdominals and gently posteriorly tilt the pelvis so the low back contacts the mat.
– Lift both feet; keep hips and knees flexed with shins roughly parallel to the floor.
– Curl the head and shoulder blades slightly off the mat; eyes toward the ceiling, chin softly tucked.
– Rotate the ribcage to the right, bringing the left shoulder toward the right knee as you extend the left leg to about 45° from the floor.
– Keep elbows wide and neck relaxed; think “armpit to knee,” not “elbow to knee.”
– Return to center without dropping the shoulder blades, maintaining low-back contact.
– Repeat to the left, extending the right leg to ~45° while bringing the right shoulder toward the left knee.
– Move slowly and control the range; if the low back lifts, raise the extended leg higher or reduce the reach.
– Breathe continuously—exhale during the rotation, inhale on the return.
45 Degree Bicycle Twisting Crunch Tips
‘- Gently posteriorly tilt your pelvis before you start and keep your low back in contact with the mat throughout each rep.
– If your low back starts to lift, raise the extended leg higher or shorten how far you reach out.
– Keep your hands lightly supporting the base of your skull, elbows wide, so you’re not pulling your head or neck.
– Initiate the twist from your ribcage and thoracic spine, thinking “armpit to knee” instead of “elbow to knee.”
– Keep your eyes toward the ceiling with a soft chin tuck to help the neck stay relaxed.
– Maintain your shoulder blades slightly off the mat and return to center without letting them drop down.
– Extend the opposite leg to about a 45° angle as you rotate, keeping the other hip and knee flexed with the shin roughly parallel to the floor.
– Focus on bracing the abdominals and coordinating the leg extension with the trunk rotation rather than relying on momentum.
– Move slowly and deliberately, exhaling as you rotate and inhaling as you return to center.
45 Degree Bicycle Twisting Crunch Beginner Introduction
The 45-Degree Bicycle Twisting Crunch is a mat-based core move that blends a small curl, a twist through the upper body, and a leg reach at roughly a forty-five-degree angle. It centers on the abs and side abs while the muscles at the front of the hips support the lifted legs. Throughout the motion, the pelvis stays slightly tucked so the lower back rests lightly against the ground, placing the workload on the front of the torso instead of the spine.
This exercise highlights controlled, ribcage-led rotation rather than pulling with the arms. The hands simply help support the head while the shoulders turn diagonally toward the opposite knee as the other leg lengthens away. Smooth, steady repetitions and continuous breathing keep tension in the midsection and reduce reliance on swinging or jerking. The alternating pattern also challenges coordination, as the upper body twist and opposing leg extension work together to create a precise, deliberate core challenge.