Stu and Sophie are pumping iron and eating six huge meals every day. They are on a mission to win the World Bodybuilding Finals in Las Vegas. We see how their extreme training regime affects their physical and mental health and their relationship.  Thirty-three-year-old Stu Mac is the only professional in Scotland in the international WBFF Bodybuilders Federation. Sophie, at just 23, is the only Scottish professional female in her class. With combined Instagram followers of 150,000 they are also developing a loyal following and are on the cusp of becoming social media influencers.