Assertion: fastball's spin | /r/SimilarTo | more vertical movement
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text: This is a meaty and hard to understand concept, but in its simplest form (Alan is a mathematical savant and the defacto expert at this area of analysis, I attempted to get ahold of him but failed) is that not all spin is equal, that transverse spin is valuable to fastballs, higher spin rates mean more lateral movement and lower spin means more vertical movement.