The only people who would have known about his scoliosis were his close personal attendants and family. The only descriptions of him describe him as short and thin. No one mentions any raised shoulder - not even the rumor-mongering spies of King Louis and they would have been the first to push the “deformed” line. Thomas More described him as ugly and with a withered arm - we now know the withered arm was a lie. BTW, his scoliosis is adolescent on-set - developed as a young page and squire. I’m told that it had nothing to do with rigorous physical training but I find that hard to believe.
Don’t feel run off because some people get out of control.
So we know it was adolescent onset? That is interesting. I did not know that. I am no expert on Richard. I do study on the history of science and medicine of ancient and medieval times, that is one of my interests, and I do know a bit about scoliosis. The cause of scoliosis nowadays is still hotly debated. By the way, if you are interested, here is a better modern article about scoliosis that shows a few pictures of what it looks like in the undressed individual, and for maybe others that may be following the thread. Although I am sure Richard was not seen undressed by many and probably took care not to be by any but his intimates.
http://umm.edu/health/medical/reports/articles/scoliosis
It is said not to have anything to do with physical activity but I can tell you it can be very painful - just think of living with your spine rotated - yes, you do get “used to it” to some degree, but it’s still not comfortable. Massage helps, and believe it or not moderate physical activity because it keeps things moving, but if he was as active as you say, it sounds like maybe he had an injury that set him up for this.