• Run on dirt paths instead of sun-absorbing blacktop. No dirt? At least stick to the shady side of the street. • Smear on sunscreen; it lowers body temperatures slightly after 40 minutes of exercise, finds an Oregon State University study. • Lube up with petroleum jelly or Runner’s Lube: Putting it between toes, thighs, and underarms will help avoid skin-to-skin friction and heat. • Wear cooling clothes—breathable, loose fitting, and light in color. And top off your outfit with a brimmed cotton hat to protect your head and face from the sun’s damaging rays. MORE: How Much Water Do You Really Need?
