Rebecca Prussin, Philip Harvey, and Theresa Foy DiGeronimo

In the following viewpoint, Rebecca Prussin, Philip Harvey, and Theresa Foy DiGeronimo argue that although exercise can be a beneficial form of treatment for depression and anxiety, it can also lead to exercise addiction—a serious form of dependency that adversely affects the sufferer's personal and professional life. Prussin is the director of inpatient services at St. Luke's/ Roosevelt Hospital and an assistant professor of clinical psychiatry at Columbia University in New York. Harvey is the director of clinical research and psychology training at Mt. Sinai School of Medicine in New York. DiGeronimo is a writer whose books include Raising a Healthy Athlete.

As you read, consider the following questions:

1. In what way does tolerance contribute to the cycle of exercise addiction, as the authors explain it?
2. According to the...