My book is Crackback by John Coy

Mile is excited about his junior-year football season. he knows the sport, loves playing defense and even his father can be overbearing, he's taught Miles basic skills and how to play smart and to respect the coach. Zach, who has been Miles's best friend and teammate, is transforming himself, now. He's not just bulking up, but passing out uppers and advocating shooting up steroids as something all players do. When the regular coach steps aside, belligerent inexperienced Coach Stahl takes over ans Miles has to consider carefully how important is the sport to him and how much he wants to risk. Coy obviously knows the gridiron and uses crackback, a football term meaning a block coming from the outside and behind, to symbolize all the ways sudden changes or suprises in life can throw you for a loop