I sweat a lot when I run, and this seems to be a common problem among runners. If you sweat heavily while running, try using antiperspirants that contain aluminum as an active ingredient. One study found that people who used anti-sweat products containing chemicals such as aluminum chloride or ethanol alcohol had less perspiration than those who didn’t use these products. Many leading brands of antiperspirant have been shown to reduce the amount of perspiration by up to 85 percent during exercise. You can also choose a product with little or no odor so it isn’t so noticeable if you happen to smell bad!