I would like to answer this question by answering with prayer, meditation, or reading, but I’m not consistent enough. Although, those things do help me out during the day.
The one thing for me is working out early in the morning. The workout can be at home or in the gym. It does not matter. It can be a simple push-up workout or an intense program like Insanity. As long as I start it and complete it.
Working out early gives me a sense of accomplishment and provides me with motivation to continue with my day.