because my form sucks and now I can barely walk. I am "doing it wrong". Much like most "pain" on the bike can be solved with improving flexibilty and a pro fit, most pain with swimming can be improved with improving your form. I can't see myself swim, so I don't know what I'm doing wrong. I am confident that 2-3 sessions with a coach can solve my issues in the pool, and then I can just train.