World wide Web define Tai chi as :
t'ai chi: a Chinese system of slow meditative physical exercise designed for relaxation and balance and health.

Let's make the photo from  chinlontaichi.com tell everything about tai chi powers:

And the chebucto.ns.ca define tai chi as: Supreme Ultimate Force
"The Chinese characters for Tai Chi Chuan can be translated as the 'Supreme Ultimate Force'. The notion of 'supreme ultimate' is often associated with the Chinese concept of yin-yang, the notion that one can see a dynamic duality (male/female, active/passive, dark/light, forceful/yielding, etc.) in all things. 'Force' (or, more literally, 'fist') can be thought of here as the means or way of achieving this ying-yang, or 'supreme-ultimate' discipline."

Tai chi known as: A gentle way to fight stress at mayoclinic.com
'Tai chi is an ancient Chinese tradition that, today, is practiced as a graceful form of exercise. It involves a series of movements performed in a slow, focused manner and accompanied by deep breathing.
Tai chi, also called tai chi chuan, is a noncompetitive, self-paced system of gentle physical exercise and stretching. Each posture flows into the next without pause, ensuring that your body is in constant motion."

WikiPedia further concentrate on tai chi and tell us that tai Chi is  Chinese Internal Martial art with Slow Movement
"T'ai chi ch'uan or Taijiquan, often shortened to t'ai chi, taiji or tai chi in English usage, is an internal Chinese martial art practiced for both its defense training and its health benefits. It is also typically practiced for a variety of other personal reasons: its hard and soft martial art technique, demonstration competitions, and longevity. As a result, a multitude of training forms exist, both traditional and modern, which correspond to those aims. Some of t'ai chi ch'uan's training forms are especially known for being practiced at what most people categorize as slow movement.'

Another explanation that tell us what the tai chi chuan is, from:nhs.uk; a Health-promoting Exercises
"Tai chi, also called tai chi chuan, combines deep breathing and relaxation with slow and gentle movements. Originally developed as a martial art in 13th-century China, tai chi is today practised around the world as a health-promoting exercise."

Let's tell youtube to tell us what is tai chi? with this amazing Video from susanamatthews channel:


Dr Paul Lam love and instruct people to do Tai chi excercises and He know the best what is tai chi?
Tai chi is an art embracing the mind, body and spirit
By Dr Paul Lam
"There is much more to Tai Chi than one can see, and virtually no one can describe such a complex art in one simple sentence. Yes, it's aesthetically pleasing, and most people practicing Tai Chi enjoy themselves. Certainly it's a most effective martial art. It can also take credit as a meditation for tranquility, of fostering the Taoist spirit of living in harmony with nature (not in the religious sense of spirit), of contributing to the preservation of a youthful mind and body. But as you look over the list of Tai Chi's attributes, you'll realize they fall under one heading, even under one word: Health. The practice of Tai Chi offers immense health benefits, strengthening body and mind."