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Health clubs are no longer the exclusive territory of the young and buff. Walk into a gym on any given day and you will see a representative number of the 50+ crowd.

When Miriam U. decided to join a health club after knee replacement surgery, she knew what she did not want a lot of sweaty, testosterone-laden weight lifters, a staff that knew more about fashion than they did about physiology, or a club where, at 77, she would feel out of place. "I was looking for a comfortable environment," the Massachusetts resident says.