I'm not that slim, but I'm not very overweight either. My regular regimen is a good night's sleep, a healthy diet, and moderate excercise. Also drink plenty of water.
Have a set routine that includes proper sleep, workout of any form, a balanced diet and above all, do your duties well and keep smiling through thick and thin.It is my mantra of fitness and good health.
I do a lot of walking/running on the treadmill. Just so I don't get bored, I have tons of movies that I can watch. If I get bored of the treadmill, I pull out one of the many exercise dvds or videos that I've accumulated over the years.
Drinking plenty of liquids. Drink at least eight glasses of water per day. Aside from drinking water, drink plenty of fruit juices. If you have blender, blend at least five types of fruit juices, which you can drink throughout the day. The more types of fruits you mix in your juice, the more nutrients you will get.