Bouldering I've tried --- it's okay, but it's not really aerobic exercise, which is what I'm looking for. Competitive sports --- flat no. They just don't keep

Bouldering I've tried --- it's okay, but it's not really aerobic exercise, which is what I'm looking for. Competitive sports --- flat no. They just don't keep my attention. What I do is run, because I can build that into my commute, so it doesn't feel like it's a complete waste of time. Right now I'm capable of making myself run to work twice a week, 7km each time, which is okay. Hopefully when summer comes round again I'll start running back again as well.