Experiment with walking around once every 30 minutes throughout the day. Set a timer to remind you! It will stimulate your blood flow and lead to a burst of hyper oxygenation in the brain, increasing energy and attentiveness. A walk will give your overworked brain “muscle” a minute to rejuvenate. Walk around the block. Go out to lunch. Take advantage of better weather, and spend your lunchtime in a near by park, having lunch out of a paper bag. Walk into a nearby place of worship and meditate. Consider walking during your meetings!