Stand up straight with a resistance band tied to one side.
Hold the other end of the resistance band in both hands around the height of your navel, and pick up the tension.
Keep your posture up straight, and your legs hips width apart with a slight bend in your knees.
Maintaining this posture, steadily move your hands directly forwards, straightening your elbows out.
The band will try to rotate your body around.
Use the strength in your abdominal muscles to resist this movement.
Control the movement as you bend your arms, bringing your hands back in to your body.