Do the Unexpected
It's easy to hit a plateau performing the same activities each time you hit the gym. Vary your workout program if you are experiencing boredom, a lack of results or decreased motivation. Try alternating among the various equipment and machines, time, weight, level and intensity. Mix in activities that require your body to move in ways it may not be used to, such as experimenting with yoga, swimming laps in different strokes, outdoor recreational sports - anything you don't normally do. Your body will never know what to expect next.