do you:
1) look for emotions/facial expressions of the sportsperson in the sport?
2) do a serious by-the-book composition? law of 1/3s etc?
3) just capture the moment?
4) experiment and see what you get?
5) capture all the details of the sports gear the sportsperson is using/wearing?

1) where i'm close enough, i'll try to get the faces straining or showing the exertion
2) composition? what is it?
3) more likely this than anything else
4) still a newbie, so i try different settings and see what i get...
5) nice to know, but not to important to me