The gut houses microorganisms that perform numerous roles. These bacteria aid our digestive system: over 85% of nutrient absorption occurs in the gut, largely as a function of probiotic metabolism. Probiotics, in concert with the enteric nervous system – the nervous system located within the small intestine – create most of our immune system.
Intestinal Health, Immunity, Performance
The amount of stress one can adapt to is primarily dictated by immunity. Resistance to disease, such as CORONA-virus, is primarily dictated by immunity, as is the ability to repair damaged tissue.
The amount of progress you can make as an athlete, or the amount you can recover from trauma, is primarily dictated by immunity, and is a function of the health of your gut… which is in turn dependent on the health of your fascial system.
Neurotransmitter Expression
Probiotic flora create neurotransmitters. These brain chemical messengers are the currency of all action in the human body. Neurotransmitters control autonomic activity, such as heart rate and respiration, but they also control somatic action: walking, running, throwing, punching, etc.
Like all other organs, the gut is embedded in the fascial web. The nerve bundle of the enteric nervous system monitors the length-tension relationships of the fascial web, much like a three-dimensional network of cup and string telephones:

When the enteric nervous system detects length-tension disruption in the fascial web, it inhibits the kinetic chain by allowing infestational bacteria to get into the small intestine. Doing so lowers the supply of healthy neurotransmitters, thus stifling action.