Program Information My Gym Children\u2019s Fitness Center is a 600+ locations strong international corporation offering the BEST recreational fitness and gymnastics programs and blowout birthday parties for children ages 6 weeks to 10 years of age. If you\u2019ve never heard of My Gym, please visit our website, Instagram, or Facebook (@mygymfun) and get to know us; we\u2019re tons of fun and love what we do!