The Grosse Ile Tennis Center is located in one of the airplane hangars of the former Grosse Ile Naval base. In addition to a half-dozen inside tennis courts, the center has a fitness room with cardio and weight training equipment, and offers pilates, kickboxing, and fitness classes. A monthly fitness membership is $25 for individuals and $35 for families. Annual tennis memberships range from $80 for juniors to $400 for families. Anyone from the Downriver area is eligible to join.