So yeah, I'm not a good runner and I have trouble maintaining my weight, fitness and health. But I tend to stay in shape more these days simply 'cos I have a job that requires me to. It's a bit lame really, but it's nice sometimes to have that extra push. It's like getting up in the morning. I used to find it harder, as I knew that getting to work early or even on time was not rewarded as working late (without compensation) was common so I started planning on working late. Not an issue in my current job. Working late does happen, sometimes it's compensated, but it's not as common... and... if I am at work late I will be punished in some way so there's that too!
It's similar with my fitness and health. I need to do some things that are physical, and doing them keeps me in shape to a degree, but I can't gain too much weight as otherwise I need to re-buy a lot of uniform that is rarely worn. All a bit lame I know, but motivation is motivation!