Donec, Can I be so rude as to ask what other health problems you have that means your chest won't handle the workout of riding a Spyder?? Why does the Doctor THINK this'll be an issue? Does he KNOW any good reason you can't or shouldn't, as opposed to 'thinking' that?
I do know & acknowledge that everyone heals differently, & that you might not really be up to it, but hey, if you WANT to keep riding, I'd be finding a Dr that will advise you on how best to achieve that, not one who keeps telling you not to or that it can't be done!! I was only 28 years old the first time I was told that the brain, spinal, & other skeleto-muscular damage I'd received meant I would never walk or hold my kids again, & never get out of a hospital bed again; so I sacked those Drs & found some who had a better attitude, Drs who helped me return to full active duty & a full family life. Back then, going thru rehab I met a lot of really determined people who weren't going to let some pretty horrific damage & injuries slow them down, & they didn't!! Now that I've retired (again!!) & am spending more time with others with similar issues, I've met even more determined people; quite a few of whom are far worse off than me who were told all these things they could never do again but just decided that they WOULD do what they wanted & not what some Doctor told them they couldn't!! Like me, most of them have since found Doctors who are prepared to help & encourage them in achieving anything they want to....
From what I can see, having 'health issues' doesn't necessarily mean you hafta stop doing things or let them become restrictive 'health problems' unless you are prepared to let them.... Along with having supportive Medico's, your state of mind & approach are all-important to how you tackle this; rather than being told or thinking of what you CAN'T do, they & you should be thinking about what you should tackle as your next challenge in regaining the ability to do as much of everything you previously did as is possible, and getting back to doing all the things that you WANT to do!!
It's your life, LIVE IT as much as you can - Doctors are astounded every day by the things some people do when as far as the medical world 'thought' they couldn't or shouldn't be able to!! Do you WANT to keep riding your Spyder?? What exactly is stopping you?
Sorry if this sounds a bit harsh, but it IS your life, it's up to you to make of it & do as much or as little as you want - the Doctor is really only there to help you achieve whatever you can! :thumbup: