Long Arm Crunch
Long Arm Crunch Exercise Description
The long arm crunch is a bodyweight trunk-flexion exercise that targets the rectus abdominis while the obliques and deep core muscles assist in stabilization. Extending the arms straight overhead lengthens the lever, increasing the demand on the anterior core compared with a standard crunch. The movement is generated by drawing the ribcage toward the pelvis, lifting the shoulder blades from the floor without pulling on the neck or flexing at the hips. Keeping a slight posterior pelvic tilt and the lower back in light contact with the floor helps minimize hip flexor involvement and supports proper spinal mechanics. This variation emphasizes controlled range, smooth breathing, and tension through the midline rather than momentum from the arms.
- 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: 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: Female
How To Do The Long Arm Crunch Exercise
‘- Lie on your back with knees bent and feet flat, hip-width apart. Lightly posteriorly tilt the pelvis so the lower back contacts the floor.
– Engage the abdominal wall as if bracing. Extend both arms straight overhead, elbows long, biceps by your ears, palms facing inward.
– Keep the neck neutral (gaze up), ribs down, and shoulders away from ears.
– Exhale and curl the trunk: slide the ribcage toward the pelvis, lifting head, shoulders, and upper back until shoulder blades clear the floor.
– Keep arms fixed in line with your ears; do not swing them forward or use momentum.
– Pause briefly at the top while maintaining abdominal tension and a steady breath.
– Inhale and lower with control until the shoulder blades touch down; maintain pelvic position and contact of the lower back with the floor.
– Avoid yanking the chin, flaring the ribs, arching the low back, or lifting the feet/hips during the movement.
Long Arm Crunch Tips
‘- Lightly posteriorly tilt your pelvis so your lower back stays in light contact with the floor throughout the movement.
– Brace your abdominal wall before you start, as if preparing for a light impact.
– Extend both arms straight overhead with elbows long, biceps by your ears, and palms facing inward.
– Keep your neck neutral by gazing up, with ribs down and shoulders away from your ears.
– As you exhale, focus on sliding your ribcage toward your pelvis to lift your head, shoulders, and upper back.
– Lift only until your shoulder blades clear the floor, then pause briefly while maintaining abdominal tension.
– Keep your arms fixed in line with your ears; do not swing them or use them for momentum.
– Inhale as you lower with control until your shoulder blades touch down, keeping your pelvic tilt and low-back contact.
– Maintain smooth, steady breathing instead of holding your breath.
– Avoid yanking your chin, flaring your ribs, arching your low back, or lifting your feet or hips at any point.
Long Arm Crunch Beginner Introduction
The long arm crunch is a floor-based, bodyweight movement that centers on curling the torso to work the abs, with help from the side abs and deeper core muscles for control. With the legs relaxed in a bent position and the back resting on the ground, the arms reach overhead so they stay alongside the head. This longer arm position creates a bigger lever, which increases challenge through the front of the midsection compared with a regular crunch.
During each repetition, the ribs move toward the hips as the head, shoulders, and upper back rise slightly from the floor while the lower back remains gently anchored. The neck stays relaxed and uninvolved, while the hips remain relatively quiet so the effort comes mainly from the abs rather than the front of the hips. The movement style emphasizes a smaller, precise range, steady breathing, and continuous tension through the center of the body instead of swinging the arms or using speed.