I think swimming fits fairly well under a fitness skill myself, but you're right about fit people not always being able to swim. It would not be remiss to have a swimming/diving/aquatics skill separate. Martial arts should definitely be it's own skill, though.
You may know, but the creativity skill used to be just that in older games. Painting extraordinaire? You're a musical virtuoso, too. It did not really bother me back then, but individual skills have more depth and bonuses.
I think it is weird cleaning isn't a skill anymore. As an adult, cleaning is most certainly a skill. It'll take forever and is potentially disastrous if you don't know what you're doing.
