Connect one end of a resistance band to a D-ring on an ankle strap, and attach a handle to the other end. Do the same for a pair of resistance bands. Place handles to each side of shoulders with elbows below wrists. Standing straight, arm by your side. Hold the handles with underhand grip.
Keep your back straight, legs still, rotate torso 90° to one side of the body and hold for a few seconds. Return to the original position and repeat with the opposite side.