Ahimsa - non-violence - is the first of the five Yamas (moral restraints) outlined in the eightfold path of Yoga by Patanjali.
None of us think that we're violent. Yet, often we harbor "non-kind" thoughts towards ourselves and others. How many times have we said to ourselves ..."I hate him...I hate that....I hate myself for doing that?"
Do no harm in word, thought or deed. Loving kindness is what the world needs and what we all desire. We each have to be the wellspring from which this expression comes forth in order to experience it in our individual and collective worlds.
Practicing ahimsa is practicing yoga - and - just like practicing asanas (poses) - practicing ahimsa will HEAL your body!