I stay motivated by competing with myself. How fast can I get to my partner's office to meet him for lunch? (around 8 minutes for 2.1 miles) Can I ride 10 miles? (not yet) Can I break my weekly mileage record? (yes!) How many miles can I get in in gear combo X?

Since I just moved and I use my bike as my primary transportation, I'm always going new places. That helps keep the interest level up. Finding raspberries in the Arboretum on Wednesday was awesome! If I'd been in a car I'd never have seen them. Now I have a reason to ride that route more... they should be ripe soon and I want to beat the birds to them.

The exercise high doesn't hurt either, but by itself it wouldn't be enough.