Generating electricity by working up a sweat — update

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It's no longer unheard of to use the energy people expend dancing to power night clubs and cell phones, as we've reported on a few occasions over the last few months. So it seems only natural to see health clubs getting in on the action with ways to capture the energy of working out. Last year we covered efforts along those lines at Hong Kong's California Fitness gym, and now a brand-new gym in Portland, Ore., is doing something similar--inspired, in fact, by the Hong Kong example. The Green Microgym, which just opened last week, is a 2,800-sq-ft neighbourhood gym…

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