Fast Burn Extreme is a potent fat burner for those who are physically active or athletes who want to maintain a lean body and keep their weight in check. The recipe comprises numerous components to help people obtain a slim body; it can also help people lose weight who are unable to exercise and contains no doping substances. What Is Fast Burn Extreme and How Does It Work? Fast Burn Extreme works in four different ways, as shown below: Metabolism is increased by 40%. The body uses fat as a source of energy. Fast Burn Extreme permits the energy stored in adipose tissue to be liberated by increasing metabolism.