Step by step instructions, muscle activation and variants for the Flexion Leg Sit-Up (straight arm).
The flexion leg sit-up with straight arms is an abdominal exercise performed with bent knees and arms extended forward throughout the movement. Keeping the arms straight removes the momentum advantage of swinging them, placing more consistent tension on the abs.
Common mistakes content is coming soon.
The Flexion Leg Sit-Up (straight arm) 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.