Long Arm Crunch

Instructions

1
Lie supine on your back with knees bent and feet flat on the floor, positioned hip-width apart. Arms extended vertically upward toward the ceiling with palms facing inward, maintaining neutral spine alignment.
2
Engage your core by drawing your navel toward your spine. Keep your neck in neutral position with eyes focused on the ceiling to avoid cervical flexion strain.
3
Slowly lower your upper back and arms toward the floor in a controlled manner, extending the torso and lengthening the abdominal muscles. Lower until you reach a comfortable stretched position without allowing excessive lumbar extension.
4
Contract the rectus abdominis by flexing the spine, pulling the chest toward the pelvis. Drive through the core to return to the starting position with arms extended vertically, squeezing the abdominals at the top of the movement.
PRIMARY MUSCLESRectus Abdominis
SECONDARY MUSCLESIliopsoas, Rectus Femoris, Sartorius
EQUIPMENTBody weight
DIFFICULTYBeginner

Overview

Focusing on the Long Arm Crunch allows you to target the Rectus Abdominis with precision. As a foundational Strength exercise, the integration of Body weight provides the necessary tension to trigger hypertrophy, while avoiding excessive joint strain.

Benefits

  • Reduces the likelihood of Waist injuries by reinforcing connective tissue strength.
  • Improves overall Waist stability and proprioception during heavy loads.
  • Promotes balanced muscular development by effectively recruiting the Rectus Abdominis and associated synergists.
  • Acts as a highly scalable Strength movement, perfect for both beginners and elite athletes.

Common Mistakes

  • Rushing the repetition tempo instead of focusing on the mind-muscle connection with the Waist.
  • Using excessive momentum to swing the Body weight rather than controlling the eccentric phase.
  • Losing core tension, leading to poor spinal alignment and reduced power output.

Pro Tips

Think about pulling from your elbows rather than your hands to better isolate the Rectus Abdominis and minimize bicep/forearm takeover.

Muscle Anatomy

The primary driver is the Rectus Abdominis. However, the movement also recruits Iliopsoas, Rectus Femoris, Sartorius to maintain control of the Body weight.

Exercise Variations

  • Dumbbell Long Arm Crunch
  • Cable Long Arm Crunch
  • Banded Long Arm Crunch

Beginner Tips

If you are new to the Long Arm Crunch , focus on mastering the movement pattern with zero weight before adding Body weight.

Frequently Asked Questions