Step by step instructions, muscle activation and variants for the Lying Frog Crunch (feet together).
A bodyweight ab exercise performed lying on your back with the knees dropped out to the sides and the soles of the feet pressed together in a frog position. Crunching upward from this position intensifies the contraction of the rectus abdominis while reducing hip-flexor involvement.
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The Lying Frog Crunch (feet together) 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.