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The purpose of this study was to determine the variability of lower limb range of motion (ROM) during vertical jumps using inertial-based systems. Ten participants attended three laboratorial session to familiarise with the countermovement jump (session 1) and to perform three maximum countermovement jumps (session 2 and 3). Motion from the lower limbs and pelvis were tracked using an inertial-based system and sagittal plane ROM computed for the hip, knee and ankle joints. ROM was compared between sessions using t-test, typical error and effect sizes. Moderate effect sizes were observed with differences in angular data varying from12° for similar heights of the jump (p = 0.27 and d = 0.21). Moderate differences in sagittal plane ROM for the lower limbs were observed for vertical countermovement jumps which limits the use of joint ROM between sessions from inertial-based system.