When we had to survive on our wits, gather and kill our food from scratch and be more at the mercy of our environment than we are today, we probably had enough challenge to keep our brains healthy.

Beginning a new habit, or ending an old one can feel like letting go of a rope that swings a mile above the ground. So we feel reluctant to let go, after all, we've survived so far doing what we've done, why risk it.

A sense of achievement improves general confidence and self-esteem.

If we think of our brains as a map, those early roads are like grooves, tram tracks, easy to fall into.

If someone is depressed they tend to retreat within the inner circle of their comfort zone which in the longer term, may contribute to exacerbating a problem rather than soothing it and if not seeking to expand the comfort zone becomes the norm.

It used to be thought that you stopped making new neural connections in your youth and from then on your brain was fixed and it was downhill all the way. But in fact as we know from our own experience we can keep on learning and learning means changing our brain on a physical level.

Meditators are shown to have thickening in parts of the brain structure that deal with attention, memory and sensory functions. This was found to be more noticeable in older, more practiced meditators than in younger adults which is interesting because this structure usually tends to get thinner as we age.