Don't listen to your head. There is a lazy fat person in there saying, "Hey, you can do this tomorrow. You had a hard day. Sit down, take it easy, you deserve it. Here, have some ice cream. You can work it off tomorrow."

Or- in my case as a morning exerciser - that person tells me - "Hey, you can go after work tonight. The gym will be mysteriously empty/the streets will be vacant and the sun won't be shining at that horrendous angle. You'll be invigorated after working nine hours straight and ready to hit it hard!"

I envision that person on my shoulder. I tell her to go back into her cave.