Fighting Shamblers with primitive weapons taught us how to defeat brute strength with agility. This training allows to share these experiences. However, the nature of the experience is also a source of its limitations - only races the size of a Peasant or smaller can benefit from it, and even amongst those, not everyone shows the aptitude. The training also provides a few permanent bonuses:
+1 TU and THR;
+2 Energy Regen.