Lying Frog Crunch

Instructions

1
Lie flat on your back on a mat or floor with your head supported and arms at your sides with palms down for stability. Keep your lower back neutral against the floor.
2
Bend one knee and place that foot flat on the floor. Keep the opposite leg extended straight, ready for the movement. Engage your core to maintain spinal stability throughout.
3
Slowly lower the extended leg toward the floor by straightening it at the hip, allowing it to descend in a controlled manner. Stop just short of touching the floor to maintain tension and protect the lower back.
4
Raise the extended leg back up to the starting position by contracting the quadriceps and hip flexors. Drive the movement through the thigh musculature and return to the elevated position. Maintain control throughout the ascent.
PRIMARY MUSCLESQuadriceps
SECONDARY MUSCLESIliopsoas, Rectus Abdominis, Tensor Fasciae Latae
EQUIPMENTBody weight
DIFFICULTYBeginner

Overview

When programming for Quadriceps growth, the Lying Frog 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

  • Utilizes Body weight to create sustained mechanical tension, forcing deep muscle adaptation.
  • Allows for a natural movement path that closely mimics functional daily activities.
  • Acts as a highly scalable Strength movement, perfect for both beginners and elite athletes.
  • Promotes balanced muscular development by effectively recruiting the Quadriceps and associated synergists.
  • Improves overall Hips stability and proprioception during heavy loads.

Common Mistakes

  • Shrugging the shoulders or compensating with secondary muscles rather than isolating the Quadriceps.
  • 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.
  • Rushing the repetition tempo instead of focusing on the mind-muscle connection with the Hips.

Pro Tips

To maximize the Lying Frog Crunch , actively squeeze the Quadriceps at the peak of the contraction for a full second.

Exercise Variations

  • Dumbbell Lying Frog Crunch
  • Cable Lying Frog Crunch
  • Banded Lying Frog Crunch

Beginner Tips

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

Frequently Asked Questions