Lie on your back with arms and legs diagonally out so that your body forms an ‘X’. Keeping arms and legs straight, bring your right hand towards your left foot, then your left hand towards your right foot, lifting your head, neck and shoulders off the ground. That’s one rep.
Aim for one complete set of 10 to 20 reps.
TOP TIP: Keep your chin off your chest at all times.
NEXT: Diagonal crunches
Photo credit: Keith Hamlyn