7. We hear so much in the media about ensuring that you drink enough water, and it is true. Nothing zaps your concentration and gives you a headache faster than dehydration. You might need a strong coffee or soda to kick-start your brain but then leave the caffeine alone and drink lots of water.
8. The same goes for exercise. If you settle down to write for a prolonged period, make sure you get up every thirty minutes or so to stretch your legs and take a few deep breaths. I find a ten minute walk or workout (something to get the cardio going) does wonders for both my concentration and creativity.