Society is more health- and fitness-conscious than ever before. Knowing how our bodies function and what we can do to improve our over-all well being is important for leading long and healthy lives. Health is no longer regarded as simply the ?absence of disease' but rather an abundance of vitality. Vitality is generally characterized by energy, liveliness, enthusiasm, awareness and overall balance in life. It refers to wellness and well- being on all levels: physically, mentally, emotionally and spiritually.