' why is this so ' Tai chi forms are very complex and is a martial art, Qigong is more adaptable to suit everyone as is for wellbeing. It can take years to learn Tai chi but Qigong movements can be learnt in a few weeks. You can practise Qigong sitting down ' for disabled ' by adapting the movements, Tai chi you cant, you need to be pretty fit and agile. Watch a video of Tai chi and you,ll see what I mean.