I try to run a couple times a week, but now that my dog is old and can't keep up I usually just settle for nice long walks. I'm a bit heavier than I was when I really enjoyed it (210-220 now, 190ish when I enjoyed it) so my knees take a beating. I'm more likely to take a nice long bike ride to the waterfront if I can these days.
Never anything competitive. I used up all my competitive drive in high school / university sports. Now I get my kick in old men hockey and soccer leagues...