Hydration: Are you getting enough water? If you are working out regularly you need to make sure you replenish liquids. ESPECIALLY in hot weather. Regular daily intake: 8 eight ounce glasses of water PLUS 100-150% of fluid lost during training. During intense exercise you may lose 1oz. or more of water per minute through sweat (2-3L/hour of sweat) . The body can only absorb 1oz. per 3-4 minutes. The easiest way to tell that you have had enough to drink is to monitor your urine. Clear urine in significant amounts indicates adequate hydration. Dark-colored urine is concentrated with metabolic waste and means that your are dehydrated.
A good rule of thumb is to weigh your self before and after training. Replace each pound lost with at least one pint of water or sports type drink. If you are exercising for 2 hours or more, a sports drink with electrolytes and carbohydrates can keep blood sugar levels and the sodium/potassium levels steady.

So, Don't forget to drink!!!