so does swimming. Especially on a float.
I do see your point, but there's no gym exercise that would be any better, it's just the easiest substitute I guess. Surfing's a rare example in that it's tricky to train by just doing it, though.
( the mighty badger Aphrodite, on a bar stool, by your side, Fri 7 Jan 2011, 11:01, 1 reply, 15 years ago)

you are right, and using a float is something I've considered
but only since having access to a private pool.

you can build the muscles, especially arm and chest, in the gym, but not using them with the appropriate motions.

Core strength is a big thing, but that is very easily done outside the gym.
( Vipros. clever got me this far, then tricky got me in, Fri 7 Jan 2011, 11:05, Reply)

Core strength is there in pretty much any sport, though
is surfing the only thing he does?
( the mighty badger Aphrodite, on a bar stool, by your side, Fri 7 Jan 2011, 11:08, Reply)

surfing is the only thing there is!

also, yes, well, he plays double bass as well. That requires quite a lot of upper body and arm strength.
( Vipros. clever got me this far, then tricky got me in, Fri 7 Jan 2011, 11:13, Reply)