okay. i would say downhill skiing. the g forces those people have to maintan while going down a huge steep mountain all the time taking complicated turns and being timed. it was ranked the 4th most demanding by espn but espn has no clue what theyre talking about. maybe if they started broadcasting it instead of making people watching on bbc or cbc. anyway yeah downhill skiings amazing those guys' thighs are like the size of my waist lol