- Try riding your favorite trail in reverse, at night, or go to a completely different trail.
- Commute using a different route.
- Use ranger girl's bike instead of yours.
- Commute on your MTB instead of your commuter.
- Ride your road bike on the trail

In other words, do something different. All of a sudden, the stale old routine becomes interesting again. If all else fails, go ride a single speed, it's bound to put a smile on your face