Tumbling and Strength Class Schedule GMS is now offering Girls Tumbling and Strength Training for those who are looking to improve tumbling and conditioning skills. GMS Tumblers GMS Tumbling offers girls ages 6 and up the opportunity to learn beginner, intermediate and advanced tumbling, in a safe, structured environment. Classes are taught by GMS Team coaches and are open to everyone. Space is limited per class. Strength Training GMS Strength class is designed for gymnasts looking to improve gymnastics specific conditioning and strength. Register Here