Russian Twist

How to do it

1. Sit on the floor with your knees bent and your feet flat, and lean your torso back until it is at roughly forty-five degrees to the floor.
2. Hold your hands together in front of your chest, or hold a single weight there, and lift your feet clear of the floor if you can hold the position steadily.
3. Turn your torso to one side until your hands are beside your hip, then turn smoothly to the other side. That is one repetition.
4. Keep the movement coming from your ribcage rather than your arms, and repeat.