How to do it
Press your lower back flat against the floor throughout.
- 1
Lie on your back with your legs extended and arms by your sides.
- 2
Lift your shoulders off the ground and bring one knee towards your chest while the other leg stays extended just above the floor.
- 3
Switch legs in a smooth, controlled motion, pulling each knee in alternately.
- 4
Repeat for the desired number of repetitions.
Expert tip
Ensure you're not straining your neck; keep your gaze upwards and chin off your chest to maintain proper form.
Common mistakes
- ✕Resting the extended leg on the floor
- ✕Dropping the shoulders back to the floor
- ✕Jerking the legs through the switch