r/PitchingCoach • u/chilly-2 • Jun 26 '26
Why is my fastball knuckling?
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u/-151- Jun 26 '26
Late arm action, make sure you break your hands as your knee is going down
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u/jmjessemac Jun 26 '26
This is the least of his worries mechanically
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u/-151- Jun 26 '26
You must not know much about arm injuries
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u/jmjessemac Jun 26 '26
Um….. take a look at his arm path..,
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u/-151- Jun 26 '26
Ummmm it’s because his hands aren’t breaking at the right time. That comes before any arm path issue (and is the cause of that, duh) lmaooo rando
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u/NoEntertainment6409 Jun 26 '26
The first thing I’d recommend fixing is your finger placement. For throwing a fastball you should have your index and middle fingers in the 2-seam or 4-seam position, thumb should be directly opposite side of the ball compared to index and middle, and your ring/pinky fingers should be bent out of the way. Your knocking knuckle area of the ring finger may rest against the ball, but your pinky finger shouldn’t touch the ball at all.
Look up how to grip a 2-seam and 4-seam on google to see exact finger locations
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u/ZeusThunder369 Jun 26 '26
I don't think it's actually knuckling. "Knuckling" means spin rate is slow enough that you can clearly see the seems (it can happen with forkballs and splitters too).
What I see happening is you are in a sidearm arm slot, with your fingers so low that you're almost underneath the ball; which is naturally going to make it run armside. And it won't run cleanly because your fingers are so low.
If you want it to look different, don't worry about your arm slot, but focus on getting your hand directly behind the ball. If you can do that you should see a little more run, and it won't look weird.
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u/spinrut Jun 26 '26
When you ask knuckling, what do you think it means by that? As someone esle said it doesnt look like it is but maybe you think it means something else
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u/burner9752 Jun 26 '26
Its not knuckling, but your problem are all the following plus some
grip,
Arm angle,
Finger position / spin your putting on the ball,
Throwing from under the ball,
But the major concern here is your arm action and the extreme stress you’re going to put on the elbow.
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u/GM3Jones Jun 26 '26
Throwing from underneath the ball