GET IT OVER WITH. Exercise in the morning, before your day starts.
EXERCISE TO COMMUTE. Don't drive, try jogging or biking to work. No shower or gym facilities at the office? Then keep workout clothes and gear in your office, and exercise for your commute home at the end of the day.
HAVE "POWER LUNCHES." Use your lunchtime to workout. Even just going for a walk during lunch can burn calories. Working with weights, you don't have to worry about the "sweat factor," as you do with cardio workouts. You can strength-train in less than 30 minutes. (Remember to rest muscles for at least 48 hours between workouts.)
DON'T GO HOME FIRST! If you choose to exercise in the evening after work, go directly to your workout destination. Stopping at home first can present distractions that could interfere with your exercise plans.