Head shoulders knees and tums, knees and tums.

Back to basics, this one's simple. Lie on your back resting your hands on your thighs. Now using your abs to lift you into a curl, move your hands up your thighs till they touch your knees.

But be careful this one's tough on those muscles so if you feel your stomach muscles straining start again and try a shallower curl. Also try to keep your neck in line with your head so you don't strain your neck muscles.

Return to the starting position and do 4–8 reps. Build up to doing two sets of 8–16 reps.

Nicki's Tips: Remember, you want a taught tummy not a bulging neck so keep all the strain on those abs and take it slowly.