It's so easy to say to myself, I don't feel well today so I'm not going to exercise. Except I always tend to feel better after I exercise. (sometimes even if I feel like crap WHILE I am doing it)
I never used to buy the whole exercise makes endorphins which make you feel good thing. But more and more I'm finding it's true.
And lately, since I have been avoiding other chemicals (caffeiene, alchohol, fats and sugars) I feel it even more.