Your kids will "tumble for you" if you enroll them at San Mateo Gymnastics. San Mateo Gymnastics (SMG) has been teaching the sport of gymnastics to kids for over 35 years. With recreational classes and competitive classes that cater to a variety of age ranges, SMG gymnasts thrive in multiple goal achievement areas. Apply your $50 towards your child's tuition or merchandise and start experiencing the SMG fun!