Of course, it hurts the T-shirt a little, but it's just a kind of massage pain, what I feel as well. What is very positive is that my back while being massaged and I hope for a less irritated move.
What I have noticed that you Hoopen When the whole body tense, and we can therefore assume that the posture is improved.
I look forward to the results, and am very confident that the body feels better after a few weeks, because no matter how to move the body or what sport you driving, the body tightens and muscle groups. But I'm glad to have found something where one moves with fun and not have to force. Thus, you do it gladly and often enough not to neglect his body!