I'm 65 and am more of a runner than a cyclist. For one thing, here in Michigan I can easily run year-round whereas I find cycling in the cold very difficult and usually just ride from April to November. I have had no running injuries in recent years, and can usually place in the top third of my age group in running events from 5Ks up to half marathons (I did give up full marathons a few years ago because that really is a good way to pick up an injury for me!).

But what I enjoy about cycling is that you can enjoy it and have a good level of fitness without it having to be an aerobic activity. If you want to get a real workout on a bike you can do that, but you can also ride for distance or enjoyment without beating yourself up too much. On the other hand, running is always a workout unless you want to stop running and just walk.

As an example, on my bike I can ride from home for 20 miles or so, stop and have a nice breakfast or lunch, and ride back home comfortably at a good pace. That's certainly not something that you can do on a long run!

One other difference, though, is that it's more fun for me to run with someone else or in a group because it's easier to chat along the way to pass the time. On a bike I spend too much time just looking at someone else's rear wheel (or rear end if it's a female ).