It may be tough to break away from your busy schedule to fit in a 30- or 60-minute workout. That doesn't mean you should skip out on exercise entirely though. Anything is better than nothing, so you may need to split up your workout throughout the day.
Do 15 minutes of a fitness DVD before work, walk up and down the stairs in your building for 15 minutes during your lunch break, and take a brisk walk with your dog for 15 minutes after work. That adds up to 45 minutes of exercise! So when you can't get away for one chunk of time to hit the gym or take a Pilates class, work exercise into your life wherever you can fit it in.