<![CDATA[Background: Vertical jumping is a key physical component in volleyball, particularly during spiking and blocking. Depth jump is a plyometric exercise intended to stimulate the stretch-shortening cycle and improve explosive lower-limb performance. Objective: This study examined the change in vertical jump height after a depth-jump intervention among volleyball players at SMA Swasta Nusantara Lubuk Pakam. Methods: A one-group pretest–posttest quasi-experimental design was reported. Twelve male players aged 15–18 years were selected purposively from a population of 21 players. Vertical jump was assessed using the Sargent Jump Test. The thesis flowchart describes a six-week intervention performed twice weekly; however, the original abstract reports eight sessions over one month, and the detailed session-by-session training log was not available for verification. Results: Mean vertical jump height increased from 49.17 ± 1.99 cm to 50.83 ± 1.40 cm. The mean change was 1.67 cm (approximately 3.38%). The paired-samples t-test was reported as p = 0.001, with a 95% confidence interval for the pretest-minus-posttest difference of −2.449 to −0.885 cm.]]>
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