When you think of steroid users, it's likely you picture a male in the gym with huge muscles. But all sorts of people use steroids for all sorts of reasons.
We usually associate addiction with bad things like smoking, alcohol and gambling. But new research shows it's possible to be potentially dangerously addicted to exercise, too.
It is a misperception to think that performance-enhancing drug use is an issue in elite sport only, Kyle J.D. Mulrooney and Katinka van de Ven warn.