you have to remeber there is such a thing as negative chi and if you dont recognize it then that is where the danger is. If it doesnt feel right then you should stop....but learning what is right and what is not is the challenge and why you need to really learn from someone who knows what they are teaching. most techniques are not detrimental if you do them properly and most of the time you will not feel a negative energy but you have to learn what the negative chi feels like in order to do it properly, again something you must be taught. | 
