Sometimes when I don't really feel like riding, I go hop on the bike anyway, and by the time I get to the end of the block, I'm all smiling and glad to be out there.
My daily rides have been largely preparation for longer rides, and that helps motivate me.
There's some people I really enjoy being around on some of my rides, and that's some good motivation to get out there.
In a broader sense, I bicycle BECAUSE i like it. Consider if you can come up with some other sort of exercise that you like rather than riding?
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"be careful this rando stuff is addictive and dan's the 'pusher'."