I used to ride a lot, but it's been about 7 years and, well, I'm almost 40 now. I'm back on my bike and I feel great. I'm also eating right, so the bike just makes me drop fat. In the past 6 weeks, I've also raised my average speed by 2 mph.
The problem... and I'm embarassed to say this, since I used to do centuries ... is that I can't get past a lousy 7-mile ride! I'm totally out of it by the end. Any ideas?