What does hardest mean? Like, most difficult to learn? Hardest to master?

Football has so many unique positions, and it is a team sport so I have a hard time putting it above something like golf.

Now you don’t need to be a super athlete to play golf, but you have to have a special skill.

Same with baseball. You may not need to be the finest athlete…but hitting an 95 mph fast ball is a skill few can do.