Chinese Handcuffs by Chris Crutcher

Dillon is living with the painful memory of his brother's suicide -- and the role he played in it. To keep his mind and body occupied, he trains intensely for the Ironman triathlon. But outside of practice, his life seems to be falling apart.

Then Dillon finds a confidante in Jennifer, a star high school basketball player who's hiding her own set of destructive secrets. Together, they must find the courage to confront their demons -- before it's too late.