Good coaches can make the difference between success and failure. They have the power to turn young talent into world-beating form. But is this power being abused?

On the Line hears from athletes who experienced harassment and sexual abuse at the hands of their coaches and from a national team coach who reveals how, for a decade, he used his position to sexually abuse children in his care.

Where do coaches draw the line and what rules have been established to protect athletes and coaches alike?