SQUARE JAW, SOLID AND FIGHTING SPORT:
Why have a square, strong jaw for combat sports?
Beyond the fact that a square jaw makes us more manly and more intimidating, if we have more muscle on our jaw it can avoid a lot of problems.
To withstand shocks, a stronger, thicker and more muscular jaw allows us to prevent it from breaking up. Blows and shocks will impact the jaw bone less and will be distributed on the muscle mass that protects it.
A square, muscular jaw will therefore allow better physical endurance, the possibility of enduring longer.