Target: core, obliques

Why it works: Much like the plank, this exercise will train your deep core muscles to activate the larger obliques to be ready and waiting for the call to stabilise your torso during exercise. Your obliques will be armed
to take on the next exercise.

Lie on your left side, but rest your weight on your forearm and raise your body off the floor.

Form a straight line from your shoulders to your ankles. Contract your abs and hold.

Slowly lower yourself down and repeat on the other side.