As a runner, I am excited about Bolt's new records of 100 meters and 200 meters, and I am also excited about breaking 2 in last year's Kippgeorg marathon. But I have always questioned whether human beings can constantly break through the limits.

From the group point of view, the evolution of human body is a very long process, and it is difficult to change obviously in the short term, which also means that the limit of human beings is there and cannot be broken. A study also shows that human beings have their limits. When people exercise for days, weeks or even months, the energy consumption rate is at most 2.5 times of the basal metabolic rate, and even the fastest marathon runner in the world can't exceed this limit. This limit is determined by our physiology and cannot be changed in the short term.

Then why can some athletes keep breaking records and creating new achievements? I think we are close to the limit of human activities. This is determined by many factors. First, there must be absolutely outstanding athletes among human beings, such as Bolt and Kip George, who are gifted; The second is more scientific training that maximizes the limits of the human body; Third, the details such as teamwork, the assistance of scientific and technological products and good weather conditions are just right.