How's your diet Jim? Can play a massive part, it did for me.

Make sure you drink loads of water, loads of people aren't hydrated and don't know it. If you're always grabbing snacks, switch to healthy options (easier said than done, I know). Sounds daft, but a couple of mates of mine are addicted to podded peas!

Cut out the late nights and the beer (I used to be in sales, that's what I did lol), start the days early, go for a mile jog, failing that, a walk, and a decent breakfast afterwards, cornflakes, OJ brown toast.. if you can keep it up, it'll change your life, I did it, and I can honestly say that.