What's your summer sport this year? (Or winter if you're in Oz )

I recently discovered a fun sport: trail-running. My dogs got me into it; they love to run in the woods, so I've started running along with them. We have lots of woodland trails here and the pine needles feel nice underfoot. It's good for agility, running over the roots and rocks. I see a number of others out on the trails, too.

What are other MacNNers into this summer? Anyone else like trail-running?