In tournament in Berlin, lesse Owens won an Olympic gold medal in the 100-meter dash with a time of 10.6 seconds. was thought that a time of 10 seconds would never be beaten. The current record stands at 9.58 seconds, set by Usain Bolt of Jamaica, and his coach is aiming at a target of 9.4 seconds. In a similar way, Roger Bannister broke the four-minute barrier for the mile in 1954 However, the question remains, just how fast can humans run? The answer lies in a combination of several factors. First, there is the physical structure of the runner's muscles Depending on their structure, some muscles react either quickly and with great power, or they don't supply so much power but they can continue to work over a long period. As a consequence, sprinters tend to have more of the former, while distance runners have more of the latter. In addition to the structure of the muscles, an athlete's body shape also affects performance. Successful distance runners tend to be extremely thin but have large hearts and lungs, Sprinters, on the other hand, are heavily built and over the years have tended to get larger. Training yields improvements in a runner's performance and so does diet. Professional athletes practice weight and speed training, eat foods high in protein and carbohydrates, and they avoid fats search for speed, some athletes may use performance-enhancing drugs, which can