I try to mentally visualize how I will feel in the afternoon and evening. If I don't exercise in the morning I know I will have a horrible day. Exercise for me isn't about long term results, it's about a daily dose of another medication that helps me stabilize my moods. Start small and accept that without doubt. Don't get overly concerned with how you will look and how much weight you will lose. Focus instead on how you will feel even if you do a little each day. I also try not to get carried away because then you'll feel so tired you won't want to exercise the next day.