This book engages with the ongoing question of why many girls stop doing sport and physical activity in their teenage years. Previous research has found that many girls’ disengagement from sport takes place despite their childhood enjoyment and that frequently these same women take up sport again as adults. Within these chapters, Sheryl Clark explores what it is about this period of time that persuades many girls to disengage from sports when their male peers continue to take part; why some girls continue to take part; and most importantly how girls understand this participation. She suggests that girls’ participation in sport should be viewed as part of their ongoing constructions of ‘successful girlhood’ within a competitive schooling system and broader socioeconomic context.