"I don't feel like it"

Have you ever said that. I know I have and I'm guessing that almost every if not every athlete has said this. I have recently realized that I never feel like going outside and practicing in the hot weather we have been having, but if I go outside anyway and practice, i start to get motivated and i want to keep going. Very seldom do I feel motivated to practice in hot weather before I actually go and do it. Feelings come after action most of the time.