Knee rolls

Muscles worked

You need

How to do it

1. Lie on your back with your arms stretched out wide to the sides, palms down, and your knees bent and lifted together.
2. Keeping both shoulders pressed into the floor, lower your knees to one side until they reach the floor - or as far as they'll comfortably go - then roll them back up and over to the other side.
3. Let the movement be slow and unhurried; the twist through your waist and lower back is the whole point, and it deepens a little with every rep.