Levels of various interesting hormones like cortisol, epinephrine, testosterone, etc.
Metabolism-related things like blood insulin, glucose, ketones.
Could this be trained? In a safe environment, increasing and decreasing the levels quickly, and noticing what happens. So you would learn how exactly “high level of X” and “low level of X” feel for various values of X.
Could this be trained? In a safe environment, increasing and decreasing the levels quickly, and noticing what happens. So you would learn how exactly “high level of X” and “low level of X” feel for various values of X.