Leg Extension Crunch (with Stability Ball) - How to Perform, Muscles, Variants | SatisFIT Skip to main content

Leg Extension Crunch (with Stability Ball)

Step by step instructions, muscle activation and variants for the Leg Extension Crunch (with Stability Ball).

MediumAbsQuadriceps

About this exercise

The Leg Extension Crunch with Stability Ball combines an abdominal crunch with a simultaneous leg extension while gripping a stability ball between the feet. The added instability challenges core engagement and extends the range of motion through the rectus abdominis.

How to Perform

  • Lie on your back and grip a stability ball between your feet with knees bent toward your chest
  • Place your hands lightly behind your head or across your chest
  • Simultaneously crunch your upper body forward and extend your legs straight, keeping the ball held firmly
  • Hold the contracted position briefly, feeling the abs fully squeeze
  • Slowly return to the starting position, bending your knees and lowering your upper body
  • Keep your lower back pressed toward the floor throughout the movement

Muscle Activation

Primary
AbsQuadriceps
Secondary
CoreObliques

Common Mistakes

Common mistakes content is coming soon.

About the Leg Extension Crunch (with Stability Ball)

The Leg Extension Crunch (with Stability Ball) is a foundational movement that builds strength and muscle through controlled, progressive overload. Train it 1 to 2 times per week with 3 to 5 working sets per session, gradually adding weight or reps as form holds up.

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