Crunch Floor

Instructions

1
Lie supine on floor or mat with legs extended straight, arms positioned behind head with hands supporting the back of neck, keeping elbows wide and shoulders relaxed
2
Engage core by drawing navel toward spine, maintain neutral head position aligned with spine, ensure lower back maintains contact with floor throughout movement
3
Lower torso back toward floor by allowing hip flexors and abdominals to relax, extending the body to increase range of motion, maintaining control to prevent momentum
4
Perform crunch by flexing spine and contracting abdominals to lift shoulders and upper back off floor, driving elbows forward toward knees while maintaining hip and leg stability, return controlled to starting position with tension maintained
PRIMARY MUSCLESRectus Abdominis
SECONDARY MUSCLESIliopsoas, Rectus Femoris, Serratus Anterior, Obliques
EQUIPMENTBody weight
DIFFICULTYBeginner

Overview

If you want to isolate and overload the Rectus Abdominis, the Crunch Floor is an excellent addition to your routine. The mechanics of this Strength, Cardio exercise specifically bias the Waist, while the use of Body weight allows for a smooth, natural resistance curve.

Benefits

  • Reduces the likelihood of Waist injuries by reinforcing connective tissue strength.
  • Allows for a natural movement path that closely mimics functional daily activities.
  • Improves overall Waist stability and proprioception during heavy loads.
  • Acts as a highly scalable Strength, Cardio movement, perfect for both beginners and elite athletes.
  • Utilizes Body weight to create sustained mechanical tension, forcing deep muscle adaptation.

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.
  • Losing core tension, leading to poor spinal alignment and reduced power output.
  • Using excessive momentum to swing the Body weight rather than controlling the eccentric phase.

Pro Tips

Control the eccentric (lowering) phase of the Crunch Floor for 3-4 seconds to drastically increase time under tension.

Muscle Anatomy

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

Exercise Variations

  • Dumbbell Crunch Floor
  • Cable Crunch Floor
  • Banded Crunch Floor

Frequently Asked Questions