It’s already been said but ill put it in my language. COME’ON!! Throw the ball like you mean it!! Get angry/aggressive. (now I’m not giving anyone permission to do chewing tobacco) but every time I pitch, whether it be practice, a personal bullpen, or in a game, every single time i step on a mound, the first thing I do is throw in a huge lip of Skoal Wintergreen Longcut, the next thing I do is step on that mound and say to myself “This is my mound, I’m the boss of this field, that home plate is mine, and that stupid #### (you get the idea) is in my batter’s box.” just by doing that all I wanna do is throw a hole through my catcher’s glove. Having an intent to throw makes a difference, when I first started pitching (sophomore year of HS) i tried to keep everything smooth and relaxed, the result was topping out at 64-65 mph, after I had enough of that I started talking to Jon Huizinga (professional pitcher mainly in independent leagues) and he told me to get angry when I throw and put an intent to throw hard in my mind. Next time I threw, I was clocked at 75-76 (more then a 10 mph increase in one throwing session)
When you have an intent to throw and don’t focus on your mechanics, your body naturally throws the ball in a way your body knows it can get the most velocity out of it.
Anyone feel free to critique or debate that I say, im always looking to learn!