03 Is the brain designed to have its boundaries pushed?

Yes it is. The brain is ‘plastic’, which means it can be trained to become more expert in different things, either physical or cognitive. This happens all the time as we live our lives. It is rather more difficult for a stroke survivor than a healthy person to push boundaries because part of their brain no longer ‘works’ as it should, but this lost brain can often be replaced by training another part of the brain to take over whatever task has been lost. This is (or should be) done in the process we call “rehabilitation”. Re-training a damaged brain takes a long time – one reason why rehabilitation cannot be rushed and needs advice from trained professionals. See Pushing the Boundaries for a fuller explanation (chapter 39, fact three.)