I am personally extrinsically motivated through rewards and praise, i am very competitive. However, competitiveness is highly debated in primary schools, as noted by Lake, 2001 and Ward, Cale and Webb 2008 competitions can be seen as problematic for those children who are not competent at physical activities, the push for competitive sports in primary schools could also increase the childrens stress leves and anxiety (Barbero, Gómez, Barbero, Grande, & Castagna 2008)
In practice when teaching I would assist this situation as i would attempt to encourage participation and collaboration (Ainscow 2010).