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Step-by-step guide

1 The first exercise is the crunch, which is performed by hanging upside down with gravity boots attached to your ankles and clipped on to a chinning bar.

Crunch up slowly and then full stretch at the end, then move left and right coming up a few inches. However, you should watch your lower back for any discomfort. Do 3 sets of 10 reps.

Hanging leg raises -- pull face up to chest and lowering legs slowly, front and both sides, 20 middle, 10 left, 10 right. (It is not advisable to try this one at home. You need to be supervised in a reputable gym).