How to do it
Keep your knees fixed at 90 degrees throughout the entire range of motion.
- 1
Lie on your back with your hands placed beneath your glutes for support.
- 2
Bend your knees at a 90-degree angle and lift your feet off the floor.
- 3
Contract your abs and lift your hips off the floor, bringing your knees towards your chest.
- 4
Slowly lower your hips back to the starting position without letting your feet touch the floor.
- 5
Repeat for the desired number of repetitions.
Expert tip
Press your lower back into the floor to engage your abs and protect your spine.
Common mistakes
- ✕Swinging the legs up with momentum
- ✕Letting feet touch the floor between reps
- ✕Head and shoulders lifting off the floor