Thank you so much for your thoughts, girls.
Lysndan, I haven't thought at all about calisthenics... Haven't heard very much about it at all! I might look into it. Hadn't thought of the other people on the ice either! I know the ice is hard and falls will happen, but injuries happen in any sport I guess. But the ice does tend to accommodate losers with more speed than skill... That's food for thought.
Peanutter, I have absolutely no intention of sending her to any sport 5 days/week. Not unless she begs me for it, in which case I don't think we'd manage anything else (and I wouldn't mind offering other things like musical instruments later on as well as the sports). I really like the idea of team sports but only the variety I did with one training and one game/week. I'm not hardcore enough to do more than that!
At this stage though it is just that she's been asking to do dance/ballet for ages but we haven't really had the spare money to send her yet. We watched the skaters at the rink yesterday while at the shops and she was really keen to learn how to skate. I asked what she'd prefer (dance or skating) and she totally surprised me by saying skating! Probably it will pass though. And it sounds like dancing could be cheaper. And of course, it'll be warmer, LOL!