three baskets, one for each competing team. The aim was to fill a team's basket using the rocks. When the rocks reached the marked yellow line, the respective team is out and the last team standing wins. One person from each team competed in the challenge. As Hamish was the only member of the Blue Team, he ended up representing Blue. The Red Team had to choose who would compete for the Black Team and in turn, the Black Team had to choose who would compete for the Red Team, ending up in Graham competing for Black and Lisa for Red. At first, both the Red and Black Teams targeted Hamish, while his focus was on the Red basket. Throughout the challenge, tension started to build between Red and Black as Simon initially nominated Lisa in the beginning, targeting her lack of muscular strength, annoying Margie in the process. Hamish was the first to be out of the challenge, and the Red and Black teams now started to focus on each other's baskets. Red fell behind as Lisa dropped a bucket into a basket letting Graham get ahead and ultimately leading to the Black Team's first challenge win since Week 1, and the Red Team's first loss since Week 1. Week 7 – Generation Balance – As part of the Old Dogs vs Young Pups week, the contestants competed as two teams. They were taken to an aquatic centre, above which were two narrow, wobbly balance beams. One at a time, team members had to cross their beam to a table, which had twenty items on it – ten from before 1982 and ten from after 1982. The first team to return their items to the start point won a huge advantage – the choice of which member of the opposing team would weigh-in then and there, and not get a last chance workout. After leading for the first six items, Margie's sabotage of the White Team allowed the Old Dogs to take the lead and win the challenge. Week 8 – 42 km ultimate athlete – The contestants had to complete a 42 km marathon over a series of elimination rounds. The winner would get a trophy, ikg advantage at weigh in and a phone call home. Round 1 was a 21 km race on spin bikes, Kasey and Alex were eliminated. Round 2 was a 10 km race