## 4 Discussion  
The current study found that PA intensity in PE classes and in school recesses (individually and combined) was associated with excess of weight and physical fitness among our sample of Spanish schoolchildren. In this study, only a few schoolchildren reported high intensity of PA in both PE classes and school recesses. The lack of studies using this methodology to assess the intensity of PA in school context makes discussion difficult. However, our finding is in line with previous studies among schoolchildren [33; 34]. For instance, [PERSON] et al. [33] found that 31% of the Indian schoolchildren analyzed were always active during PE classes, and 38% ran and played intensely. Similarly, [PERSON] et al. [34] indicated that only 38.7% were \"always\" active during PE classes, in their study among Malaysian schoolchildren. Conversely, another study among Colombian schoolchildren  
Figure 3: Association between physical activity intensity during Physical Education classes and school recesses and excess weight and global physical fitness according. Analyses were adjusted by sex, age, type of schooling, area of residence, immigrant status, daily screen time, and weekly sport activities. BMI, body mass index; GFS, Global Fitness Score; PE, physical education. found that 30% of schoolchildren remained seated during recess. These same authors shown that 8% of participants ran and played intensely [35]. In addition, one study by [PERSON] et al. [36] found that the less than the 3% of Mexican schoolchildren analyzed spent their time in sedentary behaviors during recess, much lower than the results reported by [PERSON] et al. [37], who found higher than 70% in Dutch schoolchildren. In Spain, [PERSON] et al. [38] observed that 86.7% of the students were active during recess, compared to 13.3% who were sedentary in schoolchildren in the Region of Murcia. The low levels of PA intensity found in our study also seem to be in line with the low levels of MVPA reported in Spain [9], as well as in the Region of Murcia [10,11]. However, given the scarce information found in the literature, as well as the different methodologies applied to determine the intensity of PA during PE classes or school recesses (different PA questionnaires, GPS, accelerometers, etc. ), caution is required when interpreting these results. Regarding BMI, our results showed lower zBMI in those who reported higher intensity of PA during PE classes, school recesses, and both settings. In addition, we found a lower odd of having excess weight in participants who reported higher intensity of PA during PE classes, and both PE classes and school recesses. Our results are in line with a recent study by [PERSON] et al. [39], which showed that lower zBMI was significantly linked to a higher percentage of steps (e.g., higher PA level) accrued during both PE classes and school recesses. Similarly, [PERSON] et al. [40] found that engaging in more than 50% of PE classes in MVPA was associated with reductions in zBMI among Maltese children. Additionally, [PERSON] et al. [41] found that the presence of school policies related to recess access significantly predicted lower BMI in schoolchildren, possibly because much of the PA that takes place during the school day occurs at school recess [42]. Supporting this idea, children seem to engage more minutes in MVPA during the most of school day segments, which has been associated with lower zBMI [43]. Conversely, another study showed no significant association between excess weight and PA school recess among Brazilian adolescents [44]. However, this study was performed in older participants and in a different country to ours study, which could explain (at least partly) the mismatch. In relation to global physical fitness, we found higher zGFS in those schoolchildren engaged in high intensity of PA in PE classes, school recesses, and both settings. Similarly, a greater odd of being in the high GFS tertile in those who reported high intensity of PA in PE classes, and in both PE and recesses.