With my martial arts, it works the whole body but when I do something different, like play cricket or attempt an obsticle course, i.e work my body in different ways using muscles I don't use as much, I get really sore.
We had this company day out doing a bunch of challenges and I got a tan. I was amazed because I didn't think I could really get one but yeah, I have a nice dark brown with a tint of red skin. Slightly demonic I think.
How often do you go swimming? I took lessons as a kid but haven't really swam in years now. There's a canal near where I live and I know some people do go swimming along it, maybe I should give it a shot, though you'd have to be careful of passing by boats.