They are doing different physical exercises every day. Running is what they often do. They don't stay at home in their spare time. They are all very demanding of themselves. If they have a reasonable schedule and exercise more every day, their health will get better, and eating unhealthy food will not do much harm to their health.
In addition, if they often eat junk food, it will become a habit, and the body will not reject these things and will accept them well. They also drink a lot of water, which can help their bodies get rid of toxins.
They don't seem to pay attention to diet. In fact, they are more particular than people in many countries, and the food they use is up to standard. Western meat is generally not overcooked, so they will have more nutrition and a healthy body.