Step by step instructions, muscle activation and variants for the Single Leg Extension Crunch.
The single leg extension crunch is a bodyweight core exercise that combines an abdominal crunch with the simultaneous extension of one leg. Lying on your back, you crunch your upper body up while straightening one leg, creating an anti-rotation and flexion demand that targets the upper abs and challenges core stability.
Common mistakes content is coming soon.
The Single Leg Extension Crunch 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.