OK, some of you know that my dd is a catcher, so take it with a grain of salt.
The position of catcher is the toughest on the field.
First off, they have to understand the game. They are the field general. They keep the team in the game, and direct traffic. They have to keep their pitcher calm when things aren't goin their way.
They have to wear full protective gear. Try doing this in 90 degree heat for 4 or 5 games on a Sunday.
They have to stand in a crouch position for a major portion of the game.
They have to block pitches in the dirt, chase down the ones that get away, and still try to throw a girl out at 2nd or 3rd.
They're the last defense against a run scoring against their team.
If given the opportunity to call their own game, they need to know what pitches to throw to what batters and on what count.
They're expected to throw girls out at 2nd or 3rd who can run like the wind.