In reply to harry 600:
Some pools have kayak sessions. Rowing though? Even 50m is a bit short. Climbing walls are climbing gyms for climbers.
Mountaineers? I'd rather go outside, that's my training.
I don't think you've thought this through, the best thing to do would be to add some exercise machines to an existing climbing wall to diversify training. In my experience people go climbing for training for climbing, not many people I know will go to a gym to train for it.
Plymouth's life center is a huge sports center that will run kayak sessions, has a climbing wall and a large gym/pool.
Also is there really that big of a market for it?
Post edited at 19:22