Do you have anywhere good to go walking near you? Obviously, I know I'm spoiled rotten in that respect, which helps. Failing that, I recommend going running in the mornings. It's inconvenient, tiring, and not in any way enjoyable, but it's also weirdly addictive and now I can't stop. Better still, I always focus better on my writing if I go running, as I think it wakes up the brain.