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Treadmills are the best-selling home exercise machine in the U.S. for good reasons. A study that compared exercisers who worked out equally hard for the same time on several different types of machines found that they generally burned the most calories on a treadmill (see the box below). Our own research has shown that treadmills are less likely than other machines to sit unused. Treadmills let you adjust your workout from a saunter to a marathon. And like any home exercise machine, they let you work out in a cozy setting at any hour.
You'd expect a product that has been around for decades--and often costs more than $1,000--to be fairly free of glitches. That ...