Safe or "proud"?))

I'm going to miss my dance class on Saturday :(( I have a terrible backache and it seems to be the hardest choice ever: to attend this class I've been waiting for for so long (there was a 2 week break due to our teacher) or to spend my holidays in the mountains snowboarding as I'll be totally recovered))) but I doubt I'm likely to recover If i dance for three hours without a break instead of being on bedrest :-//