Sit upright on a stool, so that your hips are higher than your knees.
Tuck your feet back so they are under your knees, and ensure your legs are hip width apart.
Reach diagonally up and to the side with your weaker arm.
Stand up from the chair whilst continuing to reach up diagonally with your arm.
This should make you shift your weight through your weaker leg as you stand up.
Ensure you fully straighten your hips once you are standing.