Position yourself on four legs on a mat. Your knees should be underneath the hips and hands under the shoulders. Place a foam roller next to your left arm. Place the right forearm on the foam roller.
Rolling the foam roller with the right arm, rotate your trunk as much as you can while you exhale. Make sure you don't bend the left elbow. Return to the starting position in a smooth movement while you inhale. Repeat the movement for the specified amount of repetitions and then do it towards the other side.TIPS: You should feel the stretch of the muscles but not pain.