I had two TB that were racing last year and they both lived out, mostly because they hated being in and would lose alot of weight but did really well living out this year even with all the snow. We just used heavy weights and a medium/light weight underneath and were both clipped. Will be doing...
i broke my wrist a couple of years ago showjumping, at the time my mum didnt believe i broke it and made me get back on my other pony and do the jump off (which i won haha). the next day i went to the hospital to find out i broke it and the next week i was back riding and jumping again. Probaly...
my TB lost shoes all the time and couldnt keep them on but she was in training, so we put glue on shoes on, and they lasted for a good 7 weeks. she has even raced in them. i would definately recommend them.
I have a couple of horse which do it, one of them being an ex racehorse and one still racing. i mostly think they do it out of bordom but also eagerness to do something. i tend to find when they are less fit, they seem to do it less.