Sit on a mat and straighten one leg out to one side.
Bend your other leg so that your foot rests against the inner thigh of your straight leg.
Allow this knee to rest outwards.
Rest your hand on your thigh of the straight leg, and place your other hand gently behind your neck.
Turn this elbow outwards, allowing your shoulders and chest to rotate towards it.
Keeping this rotation in your body, lean sideways over your straight leg, sliding your hand down your thigh towards your foot.
You should feel a stretch in the back of your straight leg, and on the opposite side of your lower trunk.
Hold this position.