Everything we are, we share with others. Our communal living experience is an economy of beliefs, memories, and feelings in constant circulation.
Do you ever get the feeling that someone's in a particular mood as soon as they step into the room? A little later you notice their posture, way of speaking, and so on, but for a brief moment, before all that other stuff, you just know.
We express ourselves in ways we aren't aware, and in ways that our science doesn't understand very well. What's more, our expression of ourselves influences others. We share our energy, and the people around us take it with them.
Practicing Qigong allows us to act as a purifier of energy for the world. If you enter your Qigong practice with a mean mood and emerge with a joyful one, that means the mean mood ended with you. Whatever energy created that feeling of meanness has been transformed, and what you pass on will be different. You've turned lead into gold.
I believe that authentically caring for your well-being is one of the most selfless things you can do. If you feel more relaxed, then everyone in your community feels more relaxed. If you feel more spacious, then everyone in your community feels more spacious. In the Buddhist perspective, every good practice session raises the enlightenment of the whole universe!