This topic on Skill in Action (Karma Yoga) with Swami Sitaramananda is coming from the Bhagavad Gita which has teachings on the 4 paths of Yoga.  Specifically, Karma yoga is the yoga of action and teaches us that everything we do with our thoughts, speech, and body is action.  Karma is everything.

We are thinking all the time, so we should take time to consider this as an action.  All action has consequence and there is a karmic reason for our birth and for our specific situation in life  We should learn our lessons from this life as we experience the result of our past action.