Re: Long tern effects on the body from Internal Trainig, is there a risk?
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.