Cheating to Win — Francine Pascal

A dangerous game…
When track star Tony Esteban tears a tendon in his knee, it looks like he's lost his chance of being an Olympic star. But Tony refuses to give up. Against his doctor's advice, he trains harder and harder. Not even his girlfriend, Annie Whitman, can convince him to slow down.
Then a weightlifter gives Tony “magic vitamins,” and suddenly Tony is running faster than ever �" and acting mean and aggressive. When Annie discovers Tony is taking a dangerous steroid drug, she knows she has to help him stop �" before he destroys his whole life along with his Olympic dreams!