Next Event: IDFA 139: MONTREAL (Amateur & Pro) – OCTOBER 5, 2019

Jack Knife Sit-up

Jack Knife Sit-up

Preparation
Lay on floor or mat. Lie supine (on back) with hands on floor over head.

Execution
Simultaneously raise your legs and arms to meet in the jack knife position. Return to starting position. Repeat.

Comments
Begin each repetition with upper back on floor to allow abdominal muscles to work dynamically.

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