Figure 2. Mean values and 95% confidence intervals (CI) for the delta differences (post-pre) of the main outcomes across the different training groups. CMJ: countermovement jump; MAS: maximal aerobic speed; ASR: anaerobic speed reserve; RSA: repeated sprint ability; HIITind: individualized high-intensity interval training; HIITlong: long intervals high-intensity interval training; RST: repeated sprint training. *: significant differences between-groups at p <0.05; **: significant differences between-groups at p < 0.001.