Inertia

An object at rest will stay at rest unless an outside force acts upon it. That's Newton's first law of motion, and one of the biggest stumbling blocks to fitness. Even people who are physically active on a regular basis need a kick in the butt to get started. It's hard to remember that once the activity is done, you'll feel amazing. Emotionally, you'll feel good for the accomplishment of the activity and for overcoming your desire to stay at rest. There is also the release of endorphins, which chemically improve your mood.

The key is to finding your kick in the butt. You have to figure out what motivates you. I'm competitive and like numbers. I set goals that are measurable and try to hit and/or surpass them. I also watch the numbers to make sure that I'm constantly improving them. If you're competitive, find someone or something to try to beat. If you like food, think of the calories you burn working out and all the food you can eat without gaining weight. Maybe it's a combination of all of those. Maybe you like prizes and rewards. If so, set a difficult, but reasonable goal and determine what your prize will be if you reach it.

Do you have any other ideas for a kick in the butt?