Extra clothes add more weight to your body during your run.
Going for a run when it's rainy and windy can force you to bundle up with extra clothing just to keep warm. By the end of your run, you might notice that you're sweatier than usual, and consider adding extra layers for your next run, even if the weather is moderate. Although extra clothes can contribute in a minor way to helping you lose weight, wearing extra clothes isn't without risk.
Burn a Handful More Calories
Losing weight is dependent on your ability to consistently burn more calories than you consume, and running can help you reach this goal. Running burns calories quicker than most other forms of exercise, and the heavier you are, the higher caloric burn you experience. For example, a person who weighs 150 pounds burns approximately 342 calories during a half-hour run at an average pace of 6 mph. If this person adds enough extra clothes to essentially weigh 152 pounds, the caloric burn is 346 calories. The extra calories burned, theoretically, leads to faster weight loss.
Be Wary of Changes to Your Mechanics
Many people use wrist or ankle weights as a method of increasing the weight they have to carry during cardiovascular exercises such as running. The premise of doing so is similar to wearing extra clothes; by increasing your weight, you're increasing your caloric burn. The American Council on Exercise, however, cautions against adding weight if doing so negatively affects your exercise mechanics. For example, if you wear two pairs of pants that cause an awkward running stride, you increase your risk of injury.
Extra Layers Can Have Health Risks
Wearing extra clothes during your run can keep you warm during cold weather, but during warm weather, extra layers can make you too hot. When people attempt to increase their body temperature during exercise, they put themselves at an elevated risk of heat exhaustion and dehydration because of their profuse sweating. This scenario is especially relevant among those who wear rubber or plastic attire during exercise. Additionally, increased sweat during your run doesn't mean you're burning more calories.
Don't Look for Shortcuts
Unless you legitimately need extra clothes to keep you warm, don't look for shortcuts to increase the weight-loss benefits of your run. Running's high caloric burn, coupled with its other numerous health benefits, including boosting your stamina and building stronger muscles and bones, makes this exercise a valuable addition to your workout regimen. When you weigh the minor extra caloric burn you'll experience by wearing extra clothing against the risks, you're better off running for just an extra few minutes.