Starting on your side, position your legs on top of each other then move your elbow to be underneath your shoulder and bent at 90 degrees.
Raise your torso up to have a straight body and hold. Raise your top leg upwards until you feel a stretch or tension in the outer thigh, then slowly lower back down. Tense your core to maintain a straight torso throughout. Repeat for the desired amount of time.
Avoid caving inwards, keep a straight back.