5. Monitor your progress

Retake your personal fitness assessment six weeks after you start your program and then again every few months. You may notice that you need to increase the amount of time you exercise in order to continue improving. Or you may be pleasantly surprised to find that you're exercising just the right amount to meet your fitness goals.

If you lose motivation, set new goals or try a new activity. Exercising with a friend or taking a class at a fitness center may help, too.

Starting an exercise program is an important decision. But it doesn't have to be an overwhelming one. By planning carefully and pacing yourself, you can establish a healthy habit that lasts a lifetime.