I think if there's only one tip I was allowed to share, I'd probably go with education.
It doesn't cost anything to read up and stay informed about your health, your diet, the importance of exercise... All this information is freely and easily available on the internet.
Obviously, the hard part is then following through on that advice and actioning change in your life - but I think the first step is always to get some sound information.
Reading about health is a great way to stay motivated and inspired too. Many fitness magazines promote the ethos of wellbeing through success stories etc... And I find it a very effective way to keep your mind focused on your overall health.
