In terms of participating, have done a bit of running in the past until too many injuries led me to cycling which I enjoy much more than I ever did the running (although still run once a week and enter the odd local 10k race). I used to fish quite a lot (if we're counting that as a sport) and, in fact, have been published writing about fishing on a couple of occassions.
Follow football which takes up much of my time in the winter months - much of my family hails from Manchester and I've followed United all over since being a lad and, despite having to curtail my obsession in more recent years with a young family etc., I still get to a good few games including some overseas.