I did gymnastics when I was young (not very good BTW). I even got to witness the first double back somersault done in the US in competition. It is stunning how far gymnasts have pushed the sport since then. Runners have gotten a bit faster, as have swimmers. Other sports have a had incremental changes as well. But gymnasts have improved an order of magnitude or more. My gym owner won the bronze in 1960 on the balance beam doing back walkovers. 6 years old do that now.