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The three locations for a light while running are handheld, waist mounted and head mounted. I do not recommend handheld lights for several reasons. The biggest problem is that keeping the light pointed in the right direction changes your arm movement and messes up your running form[[Running Form]]. In addition, handheld lights occupy one of your hands making it tricky to do anything in the dark, though [http://www.knucklelights.com/ knuckle lights] overcome this. There are advantages and disadvantages to waist mounted and head mounted. Because a head mounted light is aligned with your eyes, it's hard to see the shape of the ground. This is best seen in the images below.