"If you're running double digits in the heat of the summer, freeze a water bottle or two the night before your run (fill it ¾ full so the water has room to turn to ice), says Dimity McDowell, co-author of
Run Like a Mother: How to Get Moving and Not Lose Your Family, Job, or Sanity.
You don't have to carry multiple bottles with you. Before your run, drive to a spot that you'll reach towards the end of your run and stash a bottle under a tree or in a discrete place. Some of the ice will have melted and you'll love the cool liquid, McDowell says.