No matter how civilized we are and how much society has curbed violent behavior. Human beings still have the same genes they had 10,000 years ago. Our bodies are designed to have a certain amount of physical stress and violence in them. We're designed to run from jaguars and fight to defend our territory.
As a longtime practitioner of yoga and a person who's been involved in physical fitness my whole life, I can tell you, yoga helps you achieve altered states of consciousness. It is not just stretching. The only way you can say that it's stretching is if you haven't done it, or that you haven't done it rigorously for a long period of time.
I think that one of the reasons why people look towards the end of humanity is that people are afraid to die alone. If you die alone, the people you love will miss you, or if they die, you miss them - the sorrow is inevitable. When you truly love someone, the thought of losing them forever is horrible.