For me it's running by a long shot. I was never a good runner. Ran the 880 in HS track because my football coach wanted me to stay in shape in the off season and was always dead last...like really, really last...lol. I'm just not built for running. When I was a kid, I was a biking fool on my Fuji Gran Tourer 12 speed. Trying to get back to be an old guy biking fool these days on my newer Fooge.