- Wear loose, light-colored. The lighter color will help reflect heat, and cotton material will help the evaporation of sweat. You may also want to try specially designed, "hi-tech" running shirts and shorts. They are often made from material meant to keep you cool.
- Sunscreen is a must. use SPF 45 just to be safe. It's important to protect your skin. You can get burned and suffer sun damage to your skin even on cloudy days.
- Stay hydrated. Before you go out, drink a glass or two of water. Carry a bottle of water or even a hydration pack such as the CamelBak. Take a drink every 15 minutes, even when you're not thirsty. When you're done with your workout, have a few more glasses of water.
- Replenish your electrolyte and salt intake while exercising you can use SUCCEED capsules--small, simple packs of sodium and electrolytes that keep my system in check.
- If you can, choose shaded trails or pathways that keep you out of the sun.
- Check the weather forecast before you start your workout. If there's a heat advisory, meaning high ozone and air pollution, you might want to take your workout indoors. These pollutants can damage your lungs.
- Most importantly, listen to your body. Stop immediately if you're feeling dizzy, faint or nauseous.