Moreover, FGB TOTAL was strongly correlated with aerobic fitness (i.e., time to exhaustion (T exh, R 2 = 0.72), maximal workload (W max, R 2 = 0.69), time to gas exchange threshold (T GET, R 2 = 0.68), and peak oxygen uptake (VO 2peak, R 2 = 0.59). The total FGB Score (FGB TOTAL) showed excellent reliability (ICC 0.9, SEM 6%). Reliability and repeatability were calculated from the three measurements. The first test was an incremental cycling test to measure aerobic fitness, and the second was a cross-training specific FGB workout performed the next day. During each session, participants had their body composition measured, and they performed two exercise tests. Twenty-one cross-training participants (9 females) finished the study protocol which included three two-day measurement sessions separated by 10 days. For these reasons, the purpose of our study was to evaluate the repeatability and reliability of Fight Gone Bad (FGB) workout and to assess its relationship with aerobic fitness. It would also be advisable to determine whether selected cross-training workouts can implement a stimulus corresponding to maximize aerobic work.
Despite the increasing number of studies in HIFT, there is still no validated test to measure its specific performance. Cross-training is a high-intensity functional training (HIFT) with multiple workout modalities.
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