I think bjlaw just summed it up perfectly. I used to be really fit 6 or 7 years ago when I lived in Scotland at Uni and biked alot, off-road and on. I hit the big 3-0 this summer and I'm renovating the bike in anticipation so when I get to 30 and give up smoking for ever and ever, I can jump on the bike, join the local club, and get really fit again .