Must say I agree with you. I'm a good athlete that can play a lot of sports well and I grew up playing pond hockey in Michigan and to this day it's the most difficult sport for me. Tennis on a hot day could be considered, especially when you consider most guys are burnt out at the tender age of 26 or 27. Gymnastics maybe. Not rugby or football in my opinion, it takes a high level of athleticism but nothing too 'difficult' about any of the specific movements or skills.