How to do it
Keep your lower back pressed flat against the floor throughout.
- 1
Lie on your back with your hands behind your head and knees bent.
- 2
Lift your shoulders off the ground to engage your abs.
- 3
Bring one knee towards your chest while rotating your torso to bring the opposite elbow towards the knee.
- 4
Return to the starting position and repeat on the other side.
- 5
Alternate sides for the desired number of repetitions.
Expert tip
Focus on contracting your obliques with each crunch to maximize engagement and avoid pulling on your neck.
Common mistakes
- ✕Yanking the neck with the hands
- ✕Swinging the knee upward with momentum
- ✕Rotating only the shoulders not the trunk