4. Squeeze in more activities

Move around in the workplace -- every little bit of activity counts: Use the farthest restroom in your building; tackle a few flights of stairs during your coffee break; park at the farthest lot in the carpark. Even standing and moving around while you're on the phone helps.

5. Have healthy snacks on hand

How do you resist those mid-afternoon shortbread cookies and chocolates your colleagues pass around? Stash nuts, fruit and other healthy snacks in your desk drawer. When you're hungry, snack on them and you'll be less tempted by the junk food around you.