Marx believed that the most effective and appropriate way of exercise and rest is taking a walk. He can talk while walking for hours on end. In 1837, due to overwork, his health broke down. However, he still walked from his residence to the University of Berlin every day. The walk made him feel good and he soon recovered his health. He once recalled, "I never expected that the weak me would recover to be so healthy and strong." Since then, he has regarded taking walks as the most important means of health and rest, and has persisted in it for a long time. Engels was an active sports enthusiast. Fencing, swimming and horseback riding were all sports he excelled in. However, the sport that benefited him the most was walking, which almost became an important part of his life. In 1870, Engels moved from Manchester to London and lived near Marx's home. From then on until Marx's death in 1883, they met almost every day. As long as the weather is fine and there are no other special reasons, they always go for a walk together around 1 p.m. After that, they throw themselves into work with abundant energy. Engels once recorded in an article that this daily walk did not stop even when Marx was seriously ill. Madame Curie was busy with scientific research throughout her life. After her husband, Shimoyuki, passed away, her work became even busier. But she realized that for the cause of science, she had to keep exercising. She chose walking as a form of exercise. She believes: "The foundation of science is a healthy body." The world-renowned scientist Einstein valued time as gold, yet he still set aside time every day to engage in sports activities. Once, he visited Belgium, and the king and queen were preparing to give this outstanding scientist a grand welcome. The railway station was decorated with lanterns and streamers. Officials in formal gowns lined up at the station to welcome him, but all the passengers had left and there was no sign of Einstein. It turned out that he was carrying a suitcase and holding a violin. He got off at a small stop before and walked all the way to the palace. The queen asked him why he didn't take the train to the terminal station but was tired on foot instead. He smiled and replied, "Queen, please don't be offended. I have always loved walking. Exercise always brings me endless joy." (Choi Ji