The countermovement jump (CMJ) is routinely used to assess changes in strength-power qualities. Common measures derived from this test include jump height, peak power and peak velocity. However, valuable information on training induced changes in CMJ performance may be missed if phase and subphase variables are not included in the analysis also. The objective of this investigation was to determine whether significant performance changes can occur in the CMJ in the absence of changes in jump height or peak-form metrics. Sixteen recreationally trained males undertook 10-weeks of resistance training consisting of weightlifting, ballistic and plyometric actions with heavy and light loads. The CMJ was performed pre- and post-test with both peak-form metrics and mean phase/subphase metrics analysed. Mean velocity (p < 0.01) and mean power (p < 0.01) significantly improved following training while peak velocity (p = 0.18), peak power (p = 0.29), and jump height (p = 0.24) did not. Work, countermovement depth, eccentric duration and total movement duration significantly improved too (p < 0.01 to 0.03). Practitioners should consider using CMJ variables beyond jump height and instantaneous metrics to more thoroughly diagnose performance changes of the leg extensors following training.