I cycle to work, since is faster than walking. Money is a good motivator too.
My fitness freak friend is one of the reasons I stay healthy. I remember when we had lunch together once and we ordered the same thing. He asked if I wanted his tomatoes, because he doesn't want the sugar! His body fat is always about 7-8% during summer time and like 12% during the winter time. He only cheats two-three times a year, so he eats the same things every other day in the year. I remember when I slapped his right tricep once and it felt like slapping a rock. He's very stringent with his diet.
Another reason for me to stay healthy, is because I don't want to disrespect the donor of the kidney.