Even if you eat only a small amount you should eat before exercise.
This way your body will have a source of carbohydrate for fuel.
You should have easily digestable foods such as fruit and yoghurt.
The average person loses about 10 cups of fluid a day. If you're
exercising you're losing even
more. In addition to the 8 to 10 glasses recommended for normal
day-to-day activity, drink at least one extra cup of juice or water
for every 20 minutes you exercise.
Paralumun New Age Village