role in decreasing intrinsic motivation. New developments Principles of SDT have been applied in many domains of life, e.g., job demands; parenting; teaching; health; including willingness to get vaccinated; morality; and technology design. Besides the domains mentioned above, SDT research has been widely applied to the field of sports. Exercise and physical activity Murcia et al. looked at the influence of peers on enjoyment in exercise. Specifically, the researchers looked at the effect of motivational climate generated by peers on exercisers by analyzing data collected through questionnaires and rating scales. The assessment included evaluation of motivational climate, basic psychological needs satisfaction, levels of self-determination and self-regulation (amotivation, external, introjected, identified and intrinsic regulation) and also the assessment of the level of satisfaction and enjoyment in exercising. Data analysis revealed that when peers are supportive and there is an emphasis on cooperation, effort, and personal improvement, the climate influences variables like basic psychological needs, motivation, and enjoyment. The task climate positively predicted the three basic psychological needs (competence, autonomy, and relatedness) and so positively predicted self-determined motivation. Task climate and the resulting self-determination were also found to positively influence the level of enjoyment that exercisers experienced during the activity. Behzadniaa et al. studied how physical education teachers' autonomy support versus control would relate to students' wellness, knowledge, performance, and intentions to persist at physical activity beyond the PE classes. The study concluded that, "...perceived autonomy support was positively related to the positive outcomes via need satisfaction and frustration and autonomous motivation, and that perceptions of teachers' control were related to students' ill-being (positively) and knowledge (negatively) through need frustration." Identified regulation was found to be more consistently associated with regular physical activity than other forms of autonomous motivation, such as intrinsic regulation, which may be triggered by pleasure derived from the activity itself. This may be explained by physical activity often relating to more mundane or repetitive actions. More recent studies suggest that different types of motivation regulate different intensities of physical activity, which may be context dependent. For example, higher frequency of vigorous physical activity was associated with autonomous motivation, but not with controlled motivation in a study in rural Uganda. In an urban disadvanteged South African population, however, an association between moderate physical activity and autonomous motivation was found, but not with vigorous physical activity. The latter study also found the association between the basic psychological needs and more