Never miss a workout? This might be for you ...

A growing number of seemingly fit and disciplined gymgoers are developing dangerous fixations on muscularity. Muscle dysmorphia, also known as vigorexia or the Adonis complex, is emerging as a ...

She is running. Sweat is dripping down her face. Her eyes linger on the numbers lit up on the treadmill. Pain is shooting through her leg. She thinks that she might have strained or pulled something ...

For years, scientists have believed that compulsive behaviors happen when people become trapped in a "habit loop" that overrides self-control. But new ...