A great cardiovascular workout - the inspiration for the StairClimber machine at the gym was gleaned from normal stairs - which will strengthen calf and leg muscles. Walk up and down the stairs while you are cleaning for a total of 30 minutesand you will burn around 180 calories, the same as you would in an energetic form of dance. "If you have time, do repetitions of stair-climbing rather than spreading them throughout the day," says Chin. "Try walking up and down six times, taking a break and repeating it, to raise your heart rate. As you get fitter, carry your cleaning equipment with you."