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Comment by sharmanaetor | Hacker News Reader

How is upper body training helping him jump higher?

Momentum of arms swinging upward. To see correct jumping form, look at proper volleyball spiking technique.

Wow cool. Wouldn't have though about this, but the arm swing seems to add 9cm to one's jump:

    Participants jumped higher (0.086 m) in the arm swing
    compared to the no-arm swing condition ... 
        --- http://www.ncbi.nlm.nih.gov/pubmed/15519601

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