Working Bum and back of thighs.
Lying down, Anchor heels into the floor, parallel to shoulders and hips. Use your bum to press your hips to the ceiling, driving your weight through your heels. If your knees wobble, focus on stabilising your anchors (heels) and press your weight into the outside of your heels.
Press your bum higher than you think you can so your bum gets the full effect.
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