Curiosity question: I sometimes see wrestlers jump up and land,
Hello and welcome,
I know what you are referring to - the enormous forces that you see wrestlers exert on each other in "professional wrestling". What this is, in actuality, is well-choreographed moves that do not actually exert that kind of force. It is mostly theatrical. If you watch sports wrestling, such as college tournaments or at the Olympics, those moves are not done.
If a wrestler were to actually throw their weight on their opponent's abdomen with that type of force, there would be contusions and haemorrhaging of the internal organs, with the spleen being particularly at risk for rupture. It would be very dangerous to apply this kind of force to another person's abdomen due to the risk of bleeding and ruptures of blood vessels and internal organs.
Professional wrestlers are true athletes, and they do know how to wrestle, but what you see is choreographed, rehearsed, and staged, for entertainment purposes.
The impact is the main concern. The force can break blood vessels, causing bleeding. It can tear ligaments and tissues. It can break bones (such as ribs). Then the second problem is that loss of integrity of those tissues, and the inflammation that the body causes in the reaction in addition to blood loss, hypovolemia, infection (if the gut is ruptured).
For example, XXXXXXX Houdini died when a person punched him hard in the gut. He died later of peritonitis from infection in his abdominal cavity due to bacteria from his gut.