Nothing works forever, and we have to eventually tweak things. The books go over it, offer different options depending on your priorities. But the one thing I have noticed is that pretty much every SS program I have done, whether it be NLP, Advanced NLP, 3 day TM, 4 day TM, HLM....They all seem to be just the right amount of stress to make gains. I have strayed and gone to other "sexier" programs, the ones that are more complicated and prevalent on social media...always to get burned out, over reached, over trained and achy, hurt, less strong. I always come back and feel better, and funny enough, get stronger too.