my brother has been a personal trainer for a few years now. He was helpful when I ran out of the physical therapy sessions allowed by my insurance company last winter, and helped me get my shoulder stronger.
He has a web site for his side business that sells vitamins and supplements. It's a bit heavy on the body builder stuff, but the multi vitamins and things like that are there at a good price (I like the vitamin B. good for energy and I hear it helps metabolize fat and is good for your liver)
anyway, just thought I'd mention it, knowing how health-concious some boaters are