Do carry a frozen water bottle in a fanny pack or in the back of your shorts. Light-colored clothes best reflect the sun. Keep cool by wearing a wet bandana or an ice pack scarf around your neck. Do acclimate yourself gradually. If exercising in the heat is completely new to you, take it easy for the first two weeks.
Most malls are now open early for mall walkers.
Do take special care if you are very underweight, very overweight, pregnant or an older adult. Stay fully hydrated at all times and take many rest breaks. Going for a hard run in the very hot part of the day might be great for your legs but could damage your skin, heart and lungs.