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In a landmark study conducted at the University of Virginia, exercise physiologist Glenn Gaesser, PhD, asked men and women to complete 15 10-minute exercise routines a week. After just 21 days, the volunteers' aerobic fitness was equal to that of people 10 to 15 years younger. Their strength, muscular endurance, and flexibility were equal to those of people up to 20 years their junior. "It would be useful for people to get out of the all-or-nothing mind-set that unless they exercise for 30 minutes, they're wasting their time," says Gaesser.
Breaking exercise into small chunks on your overscheduled days can also keep your confidence up, since skipping it altogether can make you feel tired, guilty, or depressed. Keep in mind, though, that short bursts of exercise are meant to supplement, not replace, your regular fitness routine.
Here are simple, practical ways to work exercise into your day even when you're short on time: