Using 2 tennis balls you are going to work through the body to release tension, this technique is called Myofascial release, which is massage using tennis balls in this case. We are aiming to do a full body release to start which will take half an hour, then every day choose to do a more targeted release to suit your aches. Once a week aim to do the full body half hour release and by then end of the month you will feel so much more relaxed in those muscles.