Alternate Oblique Crunch

Instructions

1
Lie supine on your back on a flat surface with knees bent and feet flat on the floor, positioned hip-width apart and approximately 12 inches from your glutes. Arms positioned with hands behind or beside the head for support without pulling on the neck.
2
Engage your core by drawing your navel toward your spine. Keep your neck in neutral position with eyes focused on the ceiling. Ensure lower back maintains contact with the floor to prevent excessive lumbar extension.
3
Slowly lower your torso back toward the floor by extending through the abdomen, allowing the spine to gradually unfold. Control the descent by maintaining tension in the core muscles. Lower until shoulder blades nearly touch the floor or until you reach your range of motion limit.
4
Drive through the abs to lift your torso upward in a curling motion, bringing your ribcage toward your pelvis. Continue until shoulders lift off the floor and you achieve maximum abdominal contraction. Return to starting position with control.
PRIMARY MUSCLESRectus Abdominis
SECONDARY MUSCLESObliquus Externus Abdominis, Obliquus Internus Abdominis, Transversus Abdominis, Hip Flexors
EQUIPMENTBody weight
DIFFICULTYBeginner

Overview

Athletic trainers and bodybuilding coaches frequently recommend the Alternate Oblique Crunch because it challenges the Rectus Abdominis through a dynamic range of motion. By relying on Body weight, it reinforces proper movement patterns and builds robust strength in the Waist region.

Benefits

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

Common Mistakes

  • Shrugging the shoulders or compensating with secondary muscles rather than isolating the Rectus Abdominis.
  • Failing to achieve a full range of motion, which drastically limits Rectus Abdominis engagement.
  • 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.

Pro Tips

Keep your breathing rhythmic: exhale sharply on the concentric push/pull, and inhale smoothly on the way down.

Muscle Anatomy

The primary driver is the Rectus Abdominis. However, the movement also recruits Obliquus Externus Abdominis, Obliquus Internus Abdominis, Transversus Abdominis, Hip Flexors to maintain control of the Body weight.

Frequently Asked Questions