Paul Kienitz, has owned and managed Riverside Athletic Club for over 39 years. We strive to be the best part of our member’s day EVERYDAY! We want to be the best part of your day too! Paul began his gym business as the Fitness Force in 1981. At that time the location was a medium sized former garage in downtown Merrill. Today Riverside Athletic Club covers just less than 30,000 square feet and is also the home of small business tenants; Studio 500, Weight Watchers, In Touch Massage Therapy, Massage by Lexy, and Noble Warrior Karate.