The Biggest Loser Australia

Challenge: Ultimate Athlete (7x36)

Air date: Mar 15, 2012

Margie won Immunity at Temptation, but not without having some cross words with Simon, who took offence to her constant badgering of Graham. The contestants trained, with The Commando letting rip at Alex for refusing to be attached to Graham. The contestants entered the Weigh-In Room for the Ultimate Athlete Challenge. A marathon taking place over several pieces of gym equipment, the prize for the overall winner was a trophy, a 1kg weight advantage and a phone call home. The contestants gave their all, pushing themselves to breaking point. Simon collapsed and had to be administered oxygen. Lydia and Margie contested the final round, a sprint to the finish.