www.psychologytoday.com/us/blog/the-athletes-way/201801/the-neuroscience-proactive-vs-hyper-reactive-thinking%3famp
Exercise likely changes faces. It allows for more nasal breathing and may widen palates through the airflow in the nasal cavity. Wider palates mean wider dental arcs. Wider dental arcs allow for more chin advancement. Crowded dental arcs (interdental distance is shorter) don’t allow as much advancement of the lower jaw / chin. An orthodontist who blows out arches super wide in kids will also produce some of the most advanced chins...often to the categorization of insanely forward. :-)
Same thing with forward. Dr. Bill Dickerson does this with adults.
oh ..this is something I didn't knew.