Physical Education classes fail to reach the minimum levels of moderate-vigorous activity recommended by international policies (50% of the class duration). Although several methodological strategies have been suggested in scientific literature to combat this limitation, few proposals exist in educational practice in this context. In this sense, the objective of this work was to integrate the emerging high intensity interval training method into a traditional learning unit of Physical Education with the intention of increasing intensity. The results showed that the students analysed improve their body composition and some components of the physical condition, in a non-significant manner. In conclusion, it seems to be a priority to include methodological strategies during physical education classes in order to achieve adequate intensity. The method presented in this practical proposal shows a positive trend in improving health in schoolchildren, although future research is necessary to confirm or refute the results found.
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