Another super fun, pretty intellectual form of sports/exercise is climbing. It always seeming like the physics and engineering types gravitate towards it, and I can attest it's another excellent way to get some exercise and to have some fun working on "problems".

As tech workers, I think I would even beyond sitting in a chair all day being physically insulting, to say that it's perhaps one of the greatest (and really a non-trivial one) occupational hazards we face.