Heat and hydration

Not sure where you are, but it's H-O-T here and that means one thing: Drink lots of fluids. Preferably water, and add a sports drink if you're exercising for more than 90 minutes at a time. This report contains more details. One tip is to drink a full glass of water at regular intervals. I don't know about you, but I typically can't stop on a bicycle long enough to drink a glass. So, you can take in smaller amounts at more frequent intervals. That's more like it. And remember: If you experience extreme weakness, or sickness to your stomach while working out, stop. This could be a sign of oncoming heat stroke.
Be careful out there!