hey, i dunno whether this is a injury, but recently whenever i exercise i get these cramps in my upper chest region on the right. Yesterday and the day before when i was running they were quite sharp and I had to stop because of them. I tried cycling and i was completely fine...i only got the cramps when running/skipping, etc. Does anyone know what this is? They just started out of the blue...nothing was different...any help would be appreciated.