Your core may be strong but is it stable? So many clients that come to me with inexplicable aches or pains, whether they are back pain, tension headaches or even plantar fasciitis, have one thing in common, an unstable core. Even those clients that regularly train and exercise, may have unstable cores, strong but unstable.  So what is the difference, why does it matter and how can it cause pain?  So firstly, the core is not just made up of…