Lie on your side with the leg you would like to exercise on top.
Prop yourself up on your forearm and lift your top leg up.
Ask your assistant to hold your leg with one arm around the inside of your ankle, and the other around the inside of your knee.
Ensure both legs are straight with your body.
Lift your hips up so that you have a straight line from your body through to your elevated leg.
Keeping this alignment with your body and upper leg, lift your lower leg straight up to join your elevated leg.
Control the movement as you lower this leg back down to gently rest on the ground.
Lift your hips back up again and repeat the movement.
Ensure you, and your partner keep your back straight and core strong throughout this movement.