I think failure training is just as useful as anything else just as long as it fits the clients needs and goals. As we all know every person is different and the training responses vary from person to person. However as fitness professionals we should be educated on how to apply this method and when this particular method of training is useful. I’ve seen it work with my own eyes and I have felt it myself, but I know that failure training is not for everyone so therefore I do a thorough evaluation with a client to see if they are ready for failure training or even the overtraining methods. As for the overtraining method in my opinion it should be used sparingly and only with the .5% who could handle those extreme demands. Currently I train a mixed martial artist. He is very skilled at what he does but I still don’t think that he is ready for that extensive training as of yet.