Extremely overweight people set out to change their lives by healthily losing half of their bodyweight over the course of a year. Expert trainer Chris Powell moves in with each individual to provide support and to guide the weight-loss journey by teaching proper nutrition and exercise technique. Each episode showcases one person's path from start to finish and reveals a transformation that is more than skin deep; special guests include chef Rocco DiSpirito, pastry chef Duff Goldman and former professional football player Donald Driver.