Plank
Assume a press-up position, but place your forearms on the floor. Brace your abs as if you were about to be punched in the gut, and hold for 30 seconds.
Side plank
Lie on your left side, propping your body up on your left elbow and forearm. Raise your hips until your body forms a straight line from shoulders to ankles. Brace your abs for 30 seconds, then repeat on your right.
Swiss-ball crunch
Lie with your hips and lower and upper back resting on a Swiss ball. Put your fingers behind your ears and crunch your chest towards your hips. Lower to the start and knock out 15 reps.
Reverse crunch
Lie on your back, knees slightly bent. Raise your knees to your chest by lifting your hips up and in. Lower your legs and repeat for 15 reps.
Cable woodchopper
Turn your right side towards a cable station and grab the rope handle of a high pulley with both hands. Pull it down and across the front of your body until your hands are outside your left knee. Reverse the movement, do 15 reps, then turn the other way for another 15.
Reverse cable woodchopper
Now use a low pulley cable. Bend and grab the rope with both hands, arms almost straight and just outside your right knee. Pull the rope up and across your body until your hands are in line with your left ear. Reverse the movement and complete 15 reps on each side.

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