jackknife sit-up
jackknife sit-up exercise guide with muscles, equipment, animation and step-by-step instructions. Target: abs. Equipment: body weight.
- Target muscle
- abs
- Muscle group
- hip flexors
- Body part
- waist
- Equipment
- body weight
Secondary muscles
hip flexors
How to perform
- Lie flat on your back with your legs extended and your arms overhead.
- Engage your core and lift your legs and upper body simultaneously, reaching your hands towards your toes.
- Pause for a moment at the top, then slowly lower your legs and upper body back down to the starting position.
- Repeat for the desired number of repetitions.