I might have to get into cycling soon. I hit 40 two months back and suddenly my body has gone to crap!!!!! If new jogging shoes don't help with my lower back problem, it's time to go with something lower impact.
That's why I ride a bike. I used to run and now my knees are shot. Biking has sort of replaced running and I think I enjoy it more. Oh and Irish I had thought about doing the later and just building my own fixed gear bike.