It's easy to see why some people would criticise when 'playing sport' seems like nothing compared to actually going to work. But take the swimmers as an example; kids of 9, 10, 11 years of age and onwards for quite a few years go to the pool for a couple of hours before they go to school, and then they go to the pool after school as well. These kids work hard, very hard, otherwise they wouldn't be representing their Countries at the Olympics. It's the same for all the sports. Dedication, along with some talent, gets you to the top, gone are the days when you could get to the Olympics by being quite a good runner. Simone Biles has been at it for years now, so that means hard work and dedication as a kid and also as an adult, for a good part of her life. The twisty thing is definitely real, and it's not just gymnasts that get it. Anything to do with rapid rotation - somersaulting, twisting, etc. - in the air can cause you to lose your sense of up and down. The thing is it comes on suddenly. Everything can be ok for years and on one somersault, suddenly, you lose where you are. It's particularly disconcerting on the trampoline, and you wouldn't want to get it when diving from a high board. Hitting water in the wrong position from a high board can be very nasty and on a trampoline you can easily break your neck.