If you're not used to cold showers, they're not exactly for the faint of heart. Opting to immerse your naked body in a torrent of frigid water might even seem like pure masochism, but evidence suggests there are reasons to take the plunge. In a series of experiments, psychologist Lena Glaser investigated the effects of people having cold showers, as part of a broader study into the psychological factors involved when people are urged to adopt new behaviors.