In all seriousness, riding is a very good thing, physically. So long as you don't crash and get all FUBAR, a good four-hour ride provides the sort of exercise that many of us just can't seem to get in our everyday lives, whether it's due to time, apathy, or whatever. I always come back from a weekend of riding and hauling half a ton of wood to a campfire, feeling stronger and more refreshed. My dad, who is of course much older and consequently has more ailments to consider, has noticed great improvements in flexibility, breathing, knee movement, back pain, etc. The most strenuous (and entertaining) bit of exercise I have ever had occurred when I was on the 120. Here's what I wrote about it when I got home (I keep a log of all my rides, because they're fun to read.)