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Countermovement jump performance and associated biomechanical variables are commonly used to monitor athletes’ neuromuscular function. The purpose of this study was to quantify the reliability and usefulness of these variables in a cohort of fourteen elite male rowers, and to apply these findings in individual athlete monitoring. Seven of the nine variables demonstrated acceptable reliability (CV < 5%). Peak power was classified as OK for usefulness (CV ≈ SWC; signal-to-noise ratio ≈ 1) while all others were classified as poor. Within the athlete monitoring program, many of the observed changes in countermovement jump variables exceeded the threshold for interpretation of a clear change based on the signal-to-noise ratio. This study demonstrates the importance of understanding the reliability and usefulness measurements for accurate interpretation of monitoring data.