7. Be flexible

If you're too busy to work out or simply don't feel up to it, take a day or two off. Go easy on yourself if you need a break. The important thing is to get back on track as soon as you can.

Now that you've regained your enthusiasm, get moving! Set your goals, make it fun and pat yourself on the back from time to time. Remember, physical activity is for life. Review these tips whenever you feel your motivation slipping.