Standing Oblique and Hip Work
You will need to stand on a raised level, I am standing on a yoga block. Standing on one leg on a yoga block may tip. Be mindful to stand in the center of the block and have the weight of your foot distributed evenly between the tribunal points, center of the heel, big toe and little toe. The movement is from lifting one side of the hip toward the ribs and reaching the hip down without shifting the ribcage away from the hip rising. The movement is small, working the oblique muscles (between the hip and the lowest ribs), and the standing hip you will feel the side of the hip (lateral hip) and the inner thigh (adductors).
Be mindful of your foot, be sure to maintain the tribunal contact points. At first use a wall for balance, then try without holding on.