Taking Care of our Bodies

I'm reposting a quote here that I got from a friend's blog this morning. It's a quote from Buddha: “To keep the body in good health is a duty; otherwise we shall not be able to keep our mind strong and clear.”
I don't get enough exercise. I always intend to, but instead I spend my time writing. That's what I have always wanted to do my entire life -- have enough time to write as much as I want. Now I have the time, that is what I am doing with my time when my time is free. My other habits are good for my body: I don't drink or smoke or eat things that are bad for me. My diet is excellent. I drink enough water, I don't eat sugar or fat. I'm a vegetarian and I eat lots of vegetables and fruit. High fiber content, low processed food, no trans fats. I laugh a lot, I try to get enough sleep, and I surround myself with loving people.
I do garden, so I get SOME exercise, and I walk some. I like to walk, I like to swim, I just don't discipline myself to do it daily as I have done in the past.
How do you take care of your body in order to keep your mind strong and clear? Or do you? And if not, is your mind strong and clear anyway?