Extracurricular activities are optional activities offered by the school that complement the academic curriculum and enhance the school's sense of community. Extracurriculars offer opportunities for leadership, travel, skill development, and social engagement and integration within the school. There is growing evidence that adolescents involved in extracurricular activities are generally happier and healthier than their uninvolved peers. In particular, research suggests that extracurricular participation positively influences adolescents' psychosocial development, problem and risk behaviors, relationship formation, and, perhaps most importantly, their academic achievement.