They have a lower center of gravity, meaning all those flips and tumbles are easier to perform! It's an inherent genetic advantage that ends with them being the best in any given country, and therefore, the Olympic athletes
Gymnastics stunt your growth, for it makes it easier to perform the tricks. I don't know the details but someone else provided more, but I do know that it does stunt growth.
lower sense of gravity helps balance
Their parents didn't feed them enough when they were kids
because they have had some bad landings in there time
They all like 5'6 or shorter
