Moving your core muscles increases blood circulation through your liver and spleen, exposing them to more immune cells. When pathogens enter through your respiratory system, faster circulation speeds up how quickly your immune system detects and responds to them.
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When we move the large muscles, that we get more circulation, and more circulation actually pumps more of our venous blood back through the liver, and the spleen gets to see more blood, et cetera. So we have a lot of immune cell contact with our blood, which is what we want. So if there's something that's come in through the respiratory system, it gets into one of the nodes, the lymph nodes, and the body has sampled it, and then that works its way through either directly in the lymph node, we may have some immune cells You know, turning on, or it may work its way through the lymph that needs to get pumped around. Those sort of signals can be seen faster the more active we are. The bottom line there is that the more you move the core muscles, the more we move those, the more we have the signals sent out from muscle saying this is a resistant body part.