[Ever Hopeful]

So, I've been using the breast slapping technique for some time, but I recently heard some conflicting advice. I recently watched this video for a Japanese massage technique. (I find this method to be similar to fat transfer.) Towards the end of the video clip, it mentions that you should always handle your breasts carefully and not to be rough with them. That perspective differs a lot from the breast slapping perspective, in which you pretty much apply a great deal of force to different parts of your breasts, even to the point of soreness.

My question is: Which is more valid? I think both methods are helpful/valuable to include for massaging (I'll probably end up using both, really), but I find it funny how different the perspective is from one technique to the next... ^^; Any thoughts?