## 4 Discussion
In addition, the study by [PERSON] et al. [66] (2021) highlighted the potential of HIIT to increase aerobic endurance in football players by repeating high-intensity training sessions lasting 5-45 s and recovery periods lasting 2-4 min for up to 40 min. It has been stated that HIIT applied at 120% of MAS allows a longer time to be spent at VO2 max intensity compared to training with a continuous loading method applied at 100% of MAS [67]. In summary, it shows that high-intensity interval training methods can positively affect aerobic capacity in football players. It shows that HIITis an effective and valuable training method for improving aerobic endurance [68]. Small-sided games involving changes in the number of players, pitch size, and task constraints are effective in increasing aerobic endurance in football players [69]. In addition, these games have been found to improve aerobic capacity, strength, speed, and endurance in young footballers [10]. It has been shown that small-sided games can lead to increases in cardiovascular endurance, passing accuracy, and decision-making skills under pressure that closely resemble real match scenarios [34]. A systematic review has emphasised that small-sided games effectively incorporate specific football match demands and offer an efficient training solution [45; 70]. [PERSON] et al. [71] (2015) compared the physiological responses of young football players in small-sided games and traditional aerobic running training and showed that small-sided games provided similar contributions to aerobic endurance. [PERSON] et al. [36] (2015) showed that small-sided games positively affected the aerobic endurance of young elite football players. In a study by [PERSON] et al., 2023 [72], the effect of 4 vs. 4 small field games (SSG) with a goalkeeper (4 vs. 4 + SG) on the physical abilities of athletes performing specific aerobic endurance training was compared. It was found that the group applying the experimental training programme of 4 vs. 4 + GK SSGs significantly improved physical and functional parameters compared to the other training group. In another study, one group did higher aerobic training with a ball and strength training with pylemetric and body-weight exercises. It was found that four weeks of high-intensity pre-season training improved aerobic capacity more than training with a ball [73]. These findings support the positive effect of small-sided games on aerobic capacity in football players and highlight its importance for improving physiological characteristics related to football performance. Small-sided games and running training were equally effective in football players [38; 74]. In a study conducted by [PERSON] et al. [75] (2023), it was found that interval running training and small-sided games improved aerobic capacity in football players. Small-sided games increase aerobic capacity and various physical and motivational outcomes in football players [10; 76]. The results of the literature support our study. It shows that the combined training (MAS and SSG) method and maximal aerobic speed method support aerobic performance development more. There are some limitations in this study. The results obtained should be interpreted according to these limitations. The fact that the research group consists of amateur football players is one of the limitations of this study. The research was designed and the groups were randomly distributed. It is recommended that future studies should be conducted with different age groups and the evaluation of football players according to their positions in order to generalise the results. In addition, different designs should be added to the MAS, CT, and NT groups to evaluate the performance outputs.