The aim of this study was to investigate the relationship between training time and exercise dependence among individuals participating in an extreme conditioning program, as well as the influence on flexibility and performance in practicing one of the exercises. This was a cross-sectional observational study with extreme conditioning program participants. Exercise dependence was assessed using the Exercise Addiction Inventory, flexibility was measured using the Wells Bench, and performance was evaluated using the Wall Ball exercise performed in the extreme conditioning program. The participants were divided into groups, according to training time, which were statistically compared (considering a significance level of p < 0.05). Training time in the extreme conditioning program showed a significant relationship with exercise dependence (p = 0.0309). However, it did not have significant effects on the flexibility (p = 0.4519) or performance (p = 0.3104) of the practitioners. Longer training time was associated with increased exercise dependence among practitioners of an extreme conditioning program.