You don't have to resort to violence but you should always have that capability
Championship Fighting: Explosive Punching and Aggressive Defense
Jack Dempsey
★ 5.0
Strength Training Anatomy - 2nd Edition
Frederic Delavier
★ 4.0
Strength Training Anatomy Workout, The
Frederic Delavier, Michael Gundill
Fit to Fight. The manual of Intense training for Combat
Consterdine Peter.
Meditations on Violence: A Comparison of Martial Arts Training & Real World...
Miller, Rory
The Gift of Fear
Becker, Gavin de_