It's been done before, Pietro wins all track and field, well most. Same with Namor and swimming. Northstar wins skiing I believe. Dazzler wins figure skating. I believe She Hulk won some thing but I forget what is was these "Olympics" take place in the Savage Land. It happened in Marvel Illustrated Swimsuit back in 1991... I would suggest picking it up if you can since it was quite amusing and interesting read.
I remember that Nightcrawler beat Spidey in the gymnastics, because he had better form, not because he was more agile.