Exercise guide
Jackknife Sit Up
How to do the Jackknife Sit Up. Works the abs. Lie flat on your back with your legs extended and arms overhead. Simultaneously raise your arms and legs…
Primary musclesAbs
Supporting musclesNot specified
EquipmentNo equipment
Tracked byReps
How to perform the jackknife sit up
- Lie flat on your back with your legs extended and arms overhead. Simultaneously raise your arms and legs, reaching your hands towards your feet. Lower back to the starting position.