- Body weight
1) Lay on the floor and extend your arms and legs in opposite directions. Lift them up towards the ceiling (about a foot or 2).
1) Curl up by tightening the core - come all the way up so you're balancing on your tailbone. As you do this, lift your knees towards your chest and touch them with your hands. Pause, 'crunch' and breathe out in the centre.
2) Now, gently lower yourself back to the starting position.