Major sports are extremely tough, I've played quite a few from golf, martial arts, football, soccer, hockey and baseball.
In my opinion, trying to hit a baseball is pretty high up there, lets forget little league where kids throw batting practice and only a fast ball, I am talking at least college level.
I went to high school world series and won in oklahoma, its a huge shock going from the typical 75-80mph pitcher to seeing some get in the late 80s and early 90s.
Then again my arm blew up being a closer my first year of college, I could throw easily low 90s which was only pitch i knew till I was in JV for one year where I learned a curve and change up.
As a hitter, forget that - any lefty facing a lefty knows the harder he throws the worse it gets, especially if there's any curve or angle on the ball. Don't think I hit over 300 my entire high school time.
Funny little fact:
Matt diaz of the atlanta braves was a catcher for my catholic high school, when I was in 8th or 9th grade? I was a JV player before changing schools to Lakeland where I was a varsity my sophmore year, any how the first pitch I threw
was I thought my best fast ball - until he put it 400+ feet dead center field over the fence, never gave up a homer until that pitch, not so fun when you usually strike people out and someone launches it like nothing.