Jim Pivarnik, a professor of kinesiology at Michigan State, says setting a comeback schedule helps ease back into a workout routine safely.

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When the center opened in 1999, the first customer was a single-person startup, LAD Industries, which wanted to improve abdominal and lower-back training on workout machines.

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Starter Phil Hughes, who hasn't thrown for the past nine days because of a bulging disk in his upper back, will continue to workout for the next couple days in a pool.

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