Good news: You don't need to sweat for an hour to experience the benefits of exercise. A study from Southern Illinois University finds just eleven minutes of resistance training can rev up your metabolism, which means you will burn more calories, even at rest. Likewise, the American College of Sports Medicine advises you can either do moderate intensity aerobic physical activity for only 30 minutes, five days a week, or vigorous activity for about 20 minutes, three days per week.
It may sound like a lot, but keep in mind the 30 minutes of recommended of cardio exercise can be performed in bouts of ten minutes throughout the day. Also, physical activity is not just reserved for the gym. What we usually do at home—cleaning, mopping, vacuuming, dancing solo to some great music—are all moderate intensity activities.
Bottom line: Move! Everything that makes you stop sitting will count toward keeping up your metabolism.