Our physical body does not require "pain for gain" exercises which encourage our fight or flight response and compress the muscles, tighten tendons, stiffen joints and acidify the blood and tissues with excess lactic acid, carbon dioxide and other metabolic waste. After age 30, these types of exercises gradually become more harmful. Qigong exercises in contrast involve stretching and toning the muscles and tendons, using slow, gentle harmonious movements which loosen and limb