I can go for a gentle run for an hour in cool weather (I live in Scotland). At the end, I am drenched in sweat and my top will be wringing. I've always sweated a lot. Most sweat is from head and neck - not arms, back or legs.
I used to think it was lack of fitness, but I don't think so (5 ultras and 3 marathons this year so far).
Whilst probably only unpleasant I do sometimes worry about other effects - especially in longer races. I do replace some fluids with isotonic drinks - usually Nuun. For ultras I also use the succeed tablets and they have stopped cramp attacks.
Doctor wasn't concerned - said it was probaly genetic. Any ideas on mitigating any effects or reducing it??
Ta/