If you are twisting/crunching to your right is it this side that is injured or the side that is stretched?
Found this thread via google. I think I have strain my intercostal muscle.I had a hard session at the wall on Friday and on Saturday evening I started getting a bruised feeling in my ribs just under my pec. No bruise was visible. As the evening worn on it got worse and by the next morning even lying down and breathing were pretty painful. It has improved since then and is only sore now when I take a deep breath.Does that sound like intercostal? I can't think of any particular movement that may have done it.