Support yourself up resting one knee and foot on the floor and both hands slighter wider than shoulder width apart, palms facing forward.
Keeping one leg off the floor, at about shoulder height, bend at the knee bringing your foot up towards your head.
Throughout the exercise aim to keep your back straight, and look down towards the floor at all times.
Repeat on both sides.

BEGINNERS
Aim for 10/12 curls each leg, repeated twice
INTERMEDIATE
Aim for 15 curls each leg, repeated twice
ADVANCED
Aim for 15+ curls each leg, repeated twice
Tutorial provided by netfit