Boxing, as a polystructural acyclic activity, requires a high level of psychomotor development and capabilities. To ensure a boxer's sports career is both long-lasting and healthy, athletes should be physically and functionally prepared for the high demands of training and competitive cycles. This research aimed to assess the functional movement capabilities of young boxers, prevent injuries, and correct imbalances and asymmetries in their bodies, using an expanded battery of FMS tests. The test battery consisted of fundamental FMS tests, including deep squat, step-over, inline lunge, supine to prone leg raise, shoulder mobility, push-up, and rotary stability. Additionally, supplementary tests were conducted to evaluate movement functionality, which covered ankle mobility (dorsiflexion), hip flexor mobility (Thomas test), thoracic spine rotational mobility, and thoracic spine extension. The purposes of these tests and the evaluation criteria were clearly explained in the study. The research was attended by younger cadets and cadets who are also active members of the "Gladijator" boxing club in Zagreb. The research results were described in detail and analyzed using the t-test for independent samples. Differences in the results were found through the analysis, with a statistically significant difference identified in only one of the variables. However, it is important to note that in the final result of the extended battery of FMS tests, no statistically significant difference was observed between the examined groups.