While their are certainly many characteristics that would constitute skill they would vary from sport to sport. In general strength, speed, agility, hand-eye coordination, and intelligence would be the measures of a fine athlete.
baseball
Skilll. Not everyone can do it.
A sport is something not everyone can do and it takes skill and it is competive so yes cupstacking is a sport.
Snow shoe-ing
aeronautical sleeping
Running.
no
5 characteristics of a good sport are run, run, run, run and sweat.
Basicly Skill Points are how good you are in a Sport. If you Manage to get 1,000 Skill Points you reach PRO ranking
No it is not a sport because if you look in a dictionary, "sport" is described as something that requires skill or physical prowness.
It always has been.
sport-specific,