MoodGYM is a free, interactive internet-based program designed to prevent and decrease symptoms of depression. This online interactive mood-booster was developed and is hosted by the Centre for Health Research (CMHR) at the Australian National University. MentalMoodGYM is designed to deliver cognitive behavior therapy (CBT), an evidence-based psychotherapy commonly used in clinical practice. The cognitive therapy component is designed to change dysfunctional beliefs and thoughts thereby lowering emotional distress.