Four young men in the UK, unhappy with their bodies for opposite reasons, spend three months trying to change them. Two are underweight and want to bulk up; two are bodybuilders whose muscle mass has become a problem they want to reverse. Celebrity trainer Mark Anthony designs their gym routines and diets, while sports doctor Kay Brennan monitors what the extremes of skinniness and bulk are doing to their health. The camera follows them through gym sessions, meal prep, and moments of frustration and progress, an observational approach that keeps the focus on daily habits rather than dramatic before-and-after reveals. Interviews let each man explain how his body image has shaped his confidence, relationships, and sense of masculinity long before the cameras arrived. The film treats both directions of body dissatisfaction as the same underlying problem rather than treating thinness and bulk as opposites, and it closes by asking whether reaching the target physique actually changes how any of them feels about himself.