Step by step instructions, muscle activation and variants for the Lying Crunch (straight legs).
The lying crunch with straight legs is a bodyweight abdominal exercise that increases the difficulty of a standard crunch by keeping the legs fully extended, which adds load to the hip flexors and demands greater core stability. It effectively targets the rectus abdominis while challenging overall trunk control.
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The Lying Crunch (straight legs) 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.