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.
Northstar runs at the speed of light these days, so Pietro can try
to beat him.