The root meaning of yoga. The word yogaโโ is derived from the Sanskrit word. โyujโ which means โto yokeโ, or โto unifyโ. In a larger sense it refers to the integration of. personality, and is the method of achieving โunion". As you sit here, your idea and your sense and experience of who you are is very strong. You are here as an individual. But what the trees are exhaling right now, you are inhaling; what you are exhaling, the trees are inhaling. In other words, one half of your lung is hanging out there. This is not just in terms of breath. Today, modern physics is proving to you that as you sit here, every subatomic particle in your body is in constant transaction with everything else in the existence. If this transaction stops, you will cease to exist. So, Yoga means to know the union of existence by experience. Learn more on Wikipedia