Have you participated in competitive gynmnastics events ? Most of those are governed by the FIG (Fédération Internationale de Gymnastique)
Nowadays most competitive  gymnastics are governed by the FIG so it is more formal now.
I have been a gymnast for 15 year=s. Would you say you are good at balance, flexibility, agility, strength, coordination, control and endurance, then ? The sport of gymnastics requires all of it Yes It helps me stay in really good shape. Speaking of good shape, are you arms, shoulders, legs, chest, back and abdominal muscle groups developed? The gymnastics movements contribute to it I would say they are pretty developed indeed What about precision, self-confidence and self-discipline ? Those are also developed through gymnastics Yes I think that's something that comes naturally. Gymnastics came from the Greeks, interestingly, it came from circus performance skills. Yes I can definitely see that. The circus contains a ton of gymnastics.
Most forms of competitive gymnastics events are governed by the Fédération Internationale de Gymnastique (FIG).