Answer: Forms of traditional Chinese body movement that increase awareness of bioenergy.
The measured, dance-like movements of Tai Chi and Qi Gong are designed to isolate specific energy pathways that are believed to run throughout the body. These movements promote energy flow through the pathways and improve function in their corresponding organs. Both of these movement arts have martial arts applications, but they're mainly practiced to enhance health and longevity, which is why those silver-haired guys look so swell.
The guy who does Tai Chi performs graceful movements or "forms" that include combinations of kicks, blows, and parries. His slow movements are coordinated with mindful breathing until his actions become activated by energy, or what the Chinese call chi, rather than muscle power. Because Tai Chi can help soothe inflamed joints, increase muscle strength, and improve balance, the Arthritis Foundation recommends Tai Chi as a remedy for arthritis.
Qi Gong aims to regulate the body, breathing, emotions, and mind. The guy who does Qi Gong is benefiting his central and autonomic nervous systems by performing poses and movements that send blood, oxygen, and energy to various body parts. Qi Gong is endorsed by many medical organizations and hospitals as a safe and effective healing therapy for various conditions. It also helps strengthen muscles, balance, and physical coordination.