The best advice I have been given is to be carefull about how much power you put into the movements in the beginning. Build up slowly over time. Also, you may see issues with hypertension from some of the breathing exercises. Again, just a little each day and build up, and maybe do some studying on yogic locks to isolate the pressure below the head.
Not an expert, so maybe find one who can give more concrete advice in these areas.
Thanks for the advice, but what I am really aiming for is information regarding the effect on the body(long term) from internal training(done correctly).
Does/can Internal Training done correctly causes harm to the body, using the various connective tissues instead of the muscles to power your movements makes me wonder about this.