Crunch and side crunch
Transition to the starting position for a classic crunch:
1. Roll gently down onto the ball with your back in the middle and your feet at 90 degrees.

2. Keep your chin off your chest and eyes to the sky. This avoids any neck strain and will help you focus on your abs doing the work rather than your neck.
Crunch up towards the sky with your hands behind your head (not shown) and repeat for 15 to 20 reps. Return to centre for the crunch and reach.

Side crunch: 

1. Start by lying on the ball, hands at ears or behind head and feet at 90 degrees.

Crunch up and reach your left arm across your body and outwards. Keep the right arm back and refrain from pulling on your neck. Come down and repeat on the other side.
Do this combination in 3 sets of 25 to 50 reps.

Finish everything off with a three-minute rest in child's pose.

Workout, words and images from Nikki Fogden-Moore