Nine hour gyms in Baltimore that include both suburban and downtown athletic club locations. Voted Baltimore's best gym. Check out our free first week!. Merritt Clubs & The Michael Phelps Swim School. Home · About Us · Pool Parties · Private Lessons · Groups Lessons · Brochures · Summer Camps · Lifeguard. KidsZones are located in our Canton, Cranbrook, Eldersburg, Towson, and White Marsh locations. For a list of hours, please visit the location page for your club. . At Merritt, we're inspired by athletes with the dedication to succeed, and we'd.