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When Minnesota Vikings quarterback Wade Wilson was diagnosed with diabetes just days before the 1985 season, he scrambled to learn how to manage the disease. With his health-and perhaps his career-hanging in the balance, Wilson deftly made the life-style changes necessary to continue play.

Many cystic fibrosis patients would gladly abandon their daily chest therapy sessions if exercise proved a safe alternative. But for now, researchers say exercise should remain an adjunct rather than a primary means of management.