Research of the Performance Effects of Customer Value of Fitness Center Customers on Customer Relationship Management and Brand Loyalty through Customer Satisfaction: Sample of Manisa City - Beşikçi, Tolga; Onağ, Zeynep; Güzel, Pinar; Bilgiç, Gizem (Annals of “Dunarea de Jos” University of Galati. Fascicle XV, Physical Education and Sport Management, 2016)