This is one of those posts that is hard to write without resorting to truisms and cliches, but the fight to get and keep fit is not easy. It's one of those things that many of us know we ought to do, and quite often want to do, but equally often find it very hard to do.
You may have heard the saying, 'Whether you think you can, or you think you can't, you're right.' (Said by Henry Ford.) Getting fit and healthy is purely something you either want to do, or don't want to do. Just thinking about it is a start, but it won't actually get you anywhere. Just how powerful your mind is can be surprising: its ability to allow you or prevent you from achieving something is very strong. So that presents the dichotomy: if your mind controls you, how do you control your mind?
All I know is that it is possible to fight against negative thoughts. Another contradictory way of putting it is that you are simultaneously your own best friend and your own worst enemy. I suppose we spend most of our lives waging the battle between the two. We will all have our own ways of managing to win - at least some of the time. In the end, it's down to willpower.