Have you noticed, looks like lots more gymnasts are choosing the ponytail rather than the bun, like on the USA team and at Nationals, and World Championships. The bun can come out really easily. Plus, if your hair isn't that long, the pony tail is easier and lighter too! And stays in better. In any case, you have to be careful not to pull your hair too tight, so it doesn't cause your hair line to go back, and the front hair by your forehead get pulled, and then you have little growing hairs there.
the ponytails!