Can you improve arm strength?

So, i know that one of the ways you may be able to improve arm "stength" is by improving technique. Example: LSU pitcher Paul Skenes increased his velosity in one off-season by 5 MPH average. That is insane. When asked how, he said he tinkered with his technique. That guy is throw rediculous heat (102+ on ha). Besides focusing on the arm strength, leg strength and core strength can be addressed. That being said, you will still be limited by genetics.