Atavism

Another interesting thing is that very high stress in children (infant or very young animals) activates a general de-repression of epigenetics. This will allow the expression of genes that may have been suppressed for thousands of years. A theory of evolution is that this may explain the some fast shifts in phenotypes of animals in the geological record.
I have wondered if things like intense athletic training, or regimens such as the Wim Hof training might also do something along those lines, but for adults.
Biology; Inheritance;