Interval training gains in popularity

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Interval training gains in popularity
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Once the domain of elite athletes, high-intensity fitness has gone mainstream.

Roy Wallack
Gear

January 15 2007

For years, Michelle Cuellar exercised five days a week. "But you wouldn't have known it by looking at me," says the 33-year-old mother of two. "I felt fit, but I was still fat."

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