Arm-Exercises-That-Really-Attack-Underarm-Fat-Photo3Fact: Only sweating the old-fashioned way, the way nature intended (through regular exercise) helps to burn calories, reduce weight and release toxins. According toJames Ting, MD, a sports medicine doctor, working up a sweat just might soothe the soreness, because exercise stimulates neurochemical pathways in the brain, resulting in the production of endorphins that act as natural painkillers, reports Fitness magazine. Also, when you sweat, your pores open and release the grit and grime that has built up inside of them,” says Whitney Bowe, MD, a dermatologist in Briarcliff Manor, New York.