BusinessWeek - Two decades ago, when Consumer Reports started evaluating treadmills, it built a test machine it called the Johnny Walker. A drum-like steel cylinder studded with green rubber balls, the Johnny Walker spins above the rolling belts of its victims, pummeling them with blows meant to simulate the footsteps of a 170-lb. runner. In the early days, after a few hours of insistent pounding, some treadmills caught fire.
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