Step by step instructions, muscle activation and variants for the Straight Leg Crossed Arms Sit-Up.
A bodyweight sit-up performed with legs fully extended and arms crossed over the chest, increasing abdominal demand compared to a bent-knee sit-up by removing the leverage benefit of bent knees. Keeping the legs straight engages the hip flexors more and requires greater core control throughout the movement.
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The Straight Leg Crossed Arms Sit-Up 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.