In reply to jlury:
Hi,
My three year old daughter has one, so while she doesn't fit your category at all, she is certainly very active!
As she is so small, she always wears it on her bum at the moment. It does malfunction (gets blocked, canula gets bent) sometimes when she really bangs it like falling over on the pump or jumping on it, but not enough for us to really worry. I would have thought that on an adult a convenient place could be found that would not get large forces on it. Many times we have thought 'oh, it's definitely going to malfunction after that' and it has been fine. The other good thing is that it usually beeps very quickly if the insulin is not going in properly.
As to sweat, I don't think it has had an effect this summer. A good soak in a swimming pool is the kind of thing that can do it, but not necessarily.
Cake
P.S. I'd be interested in whether aspects of diabetes have held you back with climbing at all