The associations between self-perception variables and objective MVPA, objective total PA, and subjective MVPA are shown in Table 2. When looking at subjective MVPA, PA enjoyment (boys (r = 0.361); girls (r = 0.438)) and PA self-efficacy (boys (r = 0.317); girls (r = 0.490)) were both independently and significantly correlated with the self-reported amount of MVPA in both boys and girls (all p < 0.01). Subjective MVPA was also positively and significantly correlated with appearance (r = 0.182, p < 0.05) and sport competence (r = 0.285, p < 0.01) in girls, although the magnitude of association was smaller. These relationships were only slightly attenuated when adjusting for BMI Z-score. For both objectively measured MVPA and total PA, only the association between PA enjoyment (r = 0.19 for each, p < 0.05) was significant in girls. This relationship was slightly attenuated when adjusting for BMI Z-score, but remained significant.