Chamber Master Lynn Gym LLC dba Mayweather Boxing and Fitness Porter Ranch CA Share: Exercise & Fitness Lynn Gym LLC dba Mayweather Boxing and Fitness Porter Ranch CA Visit Website 20215 Rinaldi st Suite 100 porter ranch, CA 91326 (323) 608-9177 About About Exciting high-tech and innovative boxing based fitness center in Porter Ranch. The workouts are dynamic and geared towards weight loss, body toning and learning boxing fundamentals.