Tai Chi Hobart YouTube
I have set up a TaiChiHobart YouTube Channel for those who are interested in following some of my inspirational videos for Tai Chi.
The Gentleman on the start screen demonstrates a very powerful embodiment of command of qi - watch carefully how he breathes and how he finishes each move. It is very easy to not quite finish the moves, not bring the qi back down into dantien. After you have learned the choreography it is the command of your internal and external qi that defines you as a practitioner of Tai Chi (Tai Qi).
There are also some videos of simple qi gong exercises which you can simply practice with no harm to yourself.
Like meditation (particularly some of the qi gong related meditation practices), some qi gong exercises are extremely powerful and for those who do not have a personal teacher you might find yourself VERY ungrounded and unsettled.
If you are looking to learn advanced practices then make sure that you are very grounded and eating an ideal diet. That you have a sound teacher who knows all the pitfalls and all the warning signs of someone becoming ungrounded.
Good luck with your practice.