Compared with ancient times and modern times, people of the same size were more powerful in ancient times than they are now, because they basically engaged in manual labor all their lives, and the natural environment was harsh, so helpless people could not survive, which of course affected their life span.
Song Wu killed the tiger, but it was not unarmed. See the following introduction for details.
When the tiger is in a hurry, it shouts at Song Wu with its tail. Song Wu quickly jumped away again. When the tiger turned around, he raised his whistle stick and slammed it on the tiger's head with all his strength. With a click, the whistle stick hit the branch. The tiger is a wild animal, and it came at Song Wu. Song Wu threw away half a stick and rode on the tiger's back. He grabbed the skin on the tiger's head with his left hand and slammed it with his right hand. It didn't take long to beat the tiger's eyes, mouth, nose and ears with blood everywhere, and he couldn't move on the ground.
Therefore, elite groups, such as professional athletes, are definitely not as good as modern people in terms of nutritious diet, scientific training, equipment exercise, drugs and so on. Modern top athletes bombarded ancient times. But the level of ordinary people is certainly not as good as that of the ancients, who had a hard environment, a lot of physical labor and a lot of exercise.