It's red yellow green like Hey I should pay attention to this Suddenly even though you may be an expert in some aspect of your life improving your hip extension in the couch test maybe the thing that restores how your knee feels so that you can go walk more And ultimately until someone shows you these vital signs and gives you a clear objective measure you'll probably have some blind spots And I would like to add to that you know Kelly being one of the most sought after physical therapists in the world you know if he has a client who comes to see him for low back pain he does three things all of which are vital signs in this book The first is he teaches people how to breathe The second is he prescribes a lot more walking And third he prescribes them to start working on their hip mobility including sitting on the floor while they're watching television