David Yao, the founder of LegooMandarin dot com and Educational Video Courses Online ( Edeo dot biz ), born in china, resides in Kuala Lumpur, Malaysia, holding Master degree from University Malaya, has 25 years’ experience in mandarin teaching for foreigners and creating a SYSTEM (more than 150 mandarin courses ) designed for foreigners to study Chinese as secondary language. As he passed ACCA many years ago and continue his PhD. in UM on Computer Science and Finance, he is glad to share his experience in IT, Accounting and Finance as well as Tai Chi, which he practices for almost 30 years. He wants to contribute more to our society with all his "Over Qualifications". Teaching is also a process of learning. He enjoys the teaching and always try to find the better solutions from outside perspective. The online education is the one of trend which will shape our future education. Combining my Master degree in IT and my mandarin teaching experience, The Online Video courses solutions combines his past 25 years’ efforts. The current and upcoming more 200 courses will prove that he is the top gun in mandarin teaching to non-native learners.  Tai Chi Fitness I was born in the central China Henan Province, 30 KM north to Chen Jia Gou, native place of Chen Style Tai Chi and 30 KM south to Shao Lin Temple, another world famous martial art born place. Martial arts gene maybe in bone! I learned Chen Style Tai Chi 30 year ago with Master Professor. Cuan Sui Tan, a close friend of Master Wang Xi An, Jack Ma's teacher. Practice Tai Chi for many years and also almost daily goer in Muay Thai Gym for nearly 10 years, I  attend Muay Thai, boxing, BJJ, MMA and Boot Camp with many prominent trainers and MMA fighters ... Combining these essential background, I will show the essence of Tai Chi and Fitness.