Sabrina, I joined Curves in late May, go 3x a week, and the first week my asthma cleared up and the second week I had better flexibility/range of motion in my arms (one of the things I really wanted), felt stronger and swear I had "harder" biceps :-) But I was unconsciously overdoing it with my dominant arm and had an ache there which then got worse/moved down into my wrist and thumb, very painful. I decided not to go for a week to see if things would improve/link to my overdoing it and nothing changed at all so I figured I also couldn't "hurt" the situation more. I went back and just was a bit gentler with that arm for a week (week 5?). Well. . . :-) then my other arm's shoulder started to ache and I got horrible pain down into my elbow and couldn't bend without shooting pains (fun trying to feed the cats, put on underwear, etc. :-) and was otherwise just in a lot of pain (so couldn't sleep) and getting kind of desperate. I hung on until last Monday (not going to Curves though for a couple weeks, last time I was there was 2 July) when I had a pre-existing doctor's appointment to review blood results from a couple weeks ago and base breathing test and other things we were looking at/tracking. Well, everything was fine but I had the low thyroid (which I suspect was "aggrevated" by the "extra" push of starting an exercise program and working hard at it) and the extreme pain and my asthma was getting out of control but I was busy with the pain, etc. so wasn't even able to care/pay any attention to that, etc.

Before going to the doctor's Monday (I last went in mid-May, this was all part of a "plan" between him and me) I assumed he was going to weigh me again and I figured I had only lost about 10 pounds in 2-3 months, not great. Some of that was being in too much pain the past couple weeks to care to eat (and having stomach problems with all the Advil I was taking that was doing nothing at all for the pain as well as too much asthma meds, etc.). He didn't weigh me but we did lots of pain/swelling (nerve compression problems in spine/shoulder/arm, whatever) and joint meds (an arthritis NSAID that works differently from Advil, I don't have any arthritis), a very short course of Prednisone, mostly to straighten out the asthma I think and now, some Synthroid for the thyroid. I'm 85-90% better here towards the end of the week, mostly problems caused by the different schedules and ways of taking several meds so I have to get up at night and often get working on the computer with my school work and "forget" to go back to bed :-) so have to nap the next day, etc. But I am not in screaming pain and I'm going to start Curves again Monday and I've got hopes and ideas of ways to do things better, etc.

You might want to get a full checkup now/after you have started this exercising and back off since you're only beginning (and have already had the can't-move "warning") and see where your body is "now". My thyroid was checked several times all last year and fine/borderline but finally very "obviously" low only since starting working on my exercising and diet, etc. I think, starting something "new" you might want to get a new readout/checkup with your doctor and make sure nothing has "changed" or that whatever has/has not changed that should of or shouldn't is identified? Not just thyroid but everything? Yesterday I had a spine x-ray just in case there's a problem with my neck but the doctor and I are just doing that as a precaution and don't think there's any complication there but who knows? One of the symptoms of low thyroid can be muscle/nerve pains and/or aggrevations so it's conceivable the thyroid meds are helping fix the pain/contributing to nerve health.

Bodies are complicated!