Get fit in 15 minutes: Blitz your post-Christmas tummy

To blitz your post-Christmas tummy, try an oblique crunch with a single leg extension, says personal trainer Nadya Fairweather (u-shape.co.uk). In this exercise, it’s important to focus on two things — breathing and not yanking your head forward.

Lie in a crunch position, with your legs at 90 degrees, hands touching either side of your head. Then, aim your right shoulder towards your left knee, lifting your head and upper back and adding a gentle twist. As you lower back down, extend the left leg out, not letting it touch the floor.

Bring the leg in again, bending the knee, lifting your upper back and aiming the opposite shoulder to the knee. Do as many as you can in 45 seconds, rest for 15 seconds, then repeat on other side. Keep alternating until you feel the burn.

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