does anyone think training can have a significant, negative effect on brain? "overtraining for the brain" in a way?
it seems like the days i always drag the most in the gym or on my bike, i also have the most trouble concentrating. not only that, but there's just a pervasive bleakness to these days.
whenever i have a great workout, my thoughts seem much more coordinated, much faster, mood is better, etc. at first, i thought this was "purely psychological", e.g. "well something good happened, of course i'm less depressed". but i'm starting to think there might be more to it, e.g. bdnf (on a good day) vs. cytokines on a bad day, etc.