There's a sword-fighting gym that I have been meaning to check out. Er, Historical European Martial Arts gym. (They also teach you how to use a polearm, which we all know is the far superior weapon.) While I do secretly long to be an amazing swordfighter, my primary reason is to find something I can do with my nephews and friends that is also a kind of "moving-around" activity that could promote health if done regularly. Like an exercise, but not boring. And it has the built-in motivation of getting to hit people. 

And you get to wear armor!