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Thirty continuous minutes of anything may seem like a tall order with a new baby at home, but keep that daily stroller outing with Junior at a light three-miles-per-hour pace and it will burn at least 106 calories. Gym-bound? Try this 26-minute interval routine from Ungaro: "It's designed to burn more calories per minute than your average steady workout but isn't too intense."
Pick any activity -- walking, running, cycling, elliptical, stairclimber -- and follow these intervals.
Originally published in FITNESS magazine, February 2010.