Analyze your morning schedule.

"You'll find there's a lot of free time there," says Gerald Endress, ACSM, fitness director at Duke Diet & Fitness Center at Duke University Medical Center. "People tell me it takes them two hours to get ready for work. It's not that they're prettying themselves up - they're basically just wasting time. But when they start exercising in the morning, they find they use their time better. One guy told me he got to work 20 minutes earlier on days he exercised. If you've got a structured period of activity, you know to keep things moving."