One way is to execute the proper basics. Have the correct grip and correct arm movement to use your body to your full potential.
The other is to have a conditioning program to follow. Strengthening your legs, core, triceps and back will surely help with your throw.
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Having your technique improved is a major key.
You can also exercise to improve the strength of your throwing arm.
Grip it across (or against) the seams. Gripping it with the seams will make it curve.
Get your arm stronger, therefor practice more or even work out. It helped me and im only 12