The International Obesity Task Force (IOTF) defines childhood obesity as a body mass index (BMI) for age above the IOTF-30 threshold. Obesity in children is a significant health risk factor due to the accumulation of adipose tissue [1]. In France, the prevalence of pediatric obesity continues to rise, exacerbated by lockdown [2]. By 2023, between 21% and 34% of French children were overweight, and between 6% and 18% were obese [3]. These children are predisposed to the development of chronic pathologies [4]. Obesity is a disease with a social dimension, requiring educational management. There is an increase in the prevalence of obesity among children whose parents have no educational background [5]. Physical activity (PA) plays a key role in children's lives, playing a multifunctional role. It contributes to psychomotor development, socialization, the establishment of sleep-wake cycles, appetite regulation and energy use [6]. In overweight children, PA is perceived as difficult and unpleasant, leading to an increase in physical inactivity and deconditioning that can interfere with growth and puberty in adolescence [7]. Joint pain and shortness of breath can discourage engagement in activities requiring a minimum metabolic level. Indeed, according to Lefèvre [8], this population requires a high level of cardio-respiratory effort, combined with physical and psychological suffering, leading them to reduce their motor commitment. These teenagers’ difficulties in practicing are thought to be due to the extra energy required to move the body in space, and a reduction in energy output [9]. The effort perceived by children or adolescents is exacerbated compared to a normal individual, manifesting itself in excessive dyspnea [10]. In addition, low-energy-use activities have become part of our daily lives, encouraging a sedentary lifestyle at the expense of physical activity. The ESTEBAN study [11] shows that screen time has increased, leading to an explosion in sedentary lifestyles. A study reveals a weekly physical activity time shorter than 90 minutes, i.e. around 20 minutes less than that of normal-weight adolescents [12]. This lower level of physical engagement is mainly explained by the fact that overweight children and adolescents participate less in sports and leisure activities [13]. Breaking the spiral of deconditioning by stimulating motivation to engage in PA independently is a goal of multidisciplinary management of obese adolescents [14].

Motivating obese children and adolescents to take part in physical activity is a major challenge. The cross-use of connected objects (COs) and the practice of playful and innovative physical activities could encourage them to maintain a regular PA practice. Although the literature reports the perverse effects of screens on sedentary behaviors and the risk of obesity, particularly in younger people [15]. By reorienting the use of COs within a therapeutic patient education (TPE) dynamic, we suppose that their use could encourage children and adolescents to adopt a more physically active lifestyle. In adults, the use of COs has been shown to improve physical fitness [16]. For Yen, these tools open up fields of action to promote PA and act on body mass control [17]. They would enable to monitor the objectives set with the individual and ensure follow-up and feedback. The proper use of COs could then enable patient to play an active role in their health, which implies a learning phase with evaluation of sensations after PA to encourage a positive perception of physical exercise [18]. COs incorporate playful elements that can make them attractive to adolescents [19]. Finally, some authors advocate the introduction of PAs, emphasizing playful aspects in their approach, to enable some children or adolescents who are not interested in the competitive aspects of conventional sport to find opportunities for motivating PA [20). By converting health-related actions into a playful variation, these devices could help to divert attention from the obstacles associated with body mass management. The main objective of our study was to investigate the representations and possible modification of the relationship to PA of obese children and adolescents who had benefited from OC awareness combined with the practice of playful PA during rehabilitation care. The secondary objective was to assess the children's and adolescents’ possible interest in new technologies discovered during their stay.