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A comparison of the mechanical effect of arm swing and countermovement on the lower extremities in vertical jumping - ScienceDirect
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Figure 2 from Tests of Vertical Jump: Countermovement Jump With Arm Swing and Reaction Jump With Arm Swing | Semantic Scholar
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Frontiers | Countermovement Jump Training Is More Effective Than Drop Jump Training in Enhancing Jump Height in Non-professional Female Volleyball Players
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