The last time I had this much fun "exercising" was learning taekwondo. I was on the bike at least twice a day everyday before work started up again, but am thinking of getting one of those handlebar iphone holders (and perhaps a more rugged case) for fielding calls while I'm out of the office, which has totally new meaning to me now. This is way better than dragging my carcass around a walking path twice a day - its like running, without the jarring soul-sucking part.
When I was younger I used to do a lot of still-water kayaking. The thing that never ceased to amaze me was moving great distances under my own power. Riding is a lot like that, and nearly as quiet when the wind is right.
I've been reading with some envy the adventurers of
Happy Trails!