**4.1 Use of assistive robotics for physical education classes**

According to the Mexican Institute of Public Health, there has been an increment of children that suffer from obesity. From 34.8% of the population between 5 and 11 years that presented that problem, the rate of children increased to 35.6% in 2018 [18]. There has been an urgency to promote physical education (PE) in elementary schools to reduce these statistics. Nevertheless, children are not interested in those classes since the methodology is tedious and does not attract their attention.

A research group used a NAO robot as a supportive tool for the teacher to increase the enthusiasm of children during physical education class [19]. The idea was to use the platform to give the instructions to the students, as well as making little demonstrations of how they needed to do the exercises.

The experimental methodology followed the standard model of a PE class, starting with basic warm-up exercises, such as rotating arms and legs, and continuing with more intense activities, like running around an area or doing squats. Finally, the class would end after a relaxation period, where both the robot and students performed different stretching exercises, as seen in **Figure 3**.

The results of this experiment showed that the robotic platform was capable of improving the attention span of the students during class while assuring that the children performed better every one of the exercises. However, it was also shown that the intervention of the instructor was needed on certain occasions since the students did not saw the platform as an authority figure. Despite the students considering the robot as a toy, the results were positive, considering that the purpose of PE class was to make more dynamic.
