Gerson, Richard F. Members for life / Cover title Members for life : proven service and retention strategies for health-fitness and sports clubs Richard Gerson. - Champaign, IL : Human Kinetics, 1999. - xiii, 217 p. : ill. ; 23 cm. Includes index. ISBN: 0736000038 LCCN: 98-049538 Subjects--Topical Terms: Physical fitness centers--Customer services.Relationship marketing.