Long Arm Crunch

Instructions

1
Lie supine on the floor or mat with knees bent at approximately 90 degrees, feet flat on the ground, and hip-width apart. Arms extended upward toward the ceiling with hands positioned behind the head or across the chest.
2
Engage core muscles and position head in neutral alignment with spine. Ensure lower back maintains contact with the floor throughout the movement to protect the lumbar spine.
3
Slowly lower the torso back toward the starting position by extending the spine and allowing the abdominal muscles to lengthen in a controlled manner. Maintain tension in the core without allowing the lower back to arch excessively.
4
Contract the rectus abdominis and iliopsoas to lift the torso forward and upward, bringing the chest toward the knees. Continue flexing at the spine until reaching peak abdominal contraction, then return to the starting position with control.
PRIMARY MUSCLESRectus Abdominis
SECONDARY MUSCLESIliopsoas, Rectus Femoris, Serratus Anterior, Transverse Abdominis
EQUIPMENTBody weight
DIFFICULTYBeginner

Overview

When programming for Rectus Abdominis growth, the Long Arm Crunch stands out as a highly efficient Strength choice. Performing this movement with Body weight forces your stabilizer muscles to work in tandem with the primary movers, translating to functional strength and enhanced muscular endurance.

Benefits

  • Promotes balanced muscular development by effectively recruiting the Rectus Abdominis and associated synergists.
  • Reduces the likelihood of Waist injuries by reinforcing connective tissue strength.
  • Improves overall Waist stability and proprioception during heavy loads.
  • Significantly enhances the structural integrity and power of the Rectus Abdominis.

Common Mistakes

  • Losing core tension, leading to poor spinal alignment and reduced power output.
  • Failing to achieve a full range of motion, which drastically limits Rectus Abdominis engagement.
  • Using excessive momentum to swing the Body weight rather than controlling the eccentric phase.

Pro Tips

To maximize the Long Arm Crunch, actively squeeze the Rectus Abdominis at the peak of the contraction for a full second.

Muscle Anatomy

The primary driver is the Rectus Abdominis. However, the movement also recruits Iliopsoas, Rectus Femoris, Serratus Anterior, Transverse Abdominis 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