Here you are going to bring your right arm up as high as you can, and then you're going to start rotating that right arm backwards. In order to make sure that your elbow stays straight squeeze your bicep and tricep a little bit, then keep rotating that right fist like you are trying to turn your palm up towards the ceiling. Keep rotating back until you can bring your right arm towards your side. With your knuckles at your side here, you are going to reverse it.
Now you are going to drive that thumb to the back wall, trying to bring that right arm back as far as we can without leaning forward. Try to pull that back once you find the end range, then open up that right shoulder to rotate your palm back up to the ceiling. From here, bring that arm up and over, as high as you can, up towards your ear then down towards your side. Next, repeat the same steps above, but with your left shoulder this time. To get the most from this, try to do two to three repetitions at least once a day on each arm!