Instead, focus on living the healthy, well-fueled and physically active lifestyle that you know you need to lead anyway. By doing that, you'll see far greater results in the arm department, anyway, Mendez says. Through a combination of balanced eating (hit all three macros at every meal!) and performing a combination of high-intensity interval cardio and strength training, you'll naturally shed fat all over, including around your arms, explains Lauren Williams, C.P.T., a trainer at PROJECT Equinox.
The skin also serves as a release point for heat. (See “Why Does My Face Turn Red When I Exercise?” for more on that.) When you exercise, your muscles generate a lot of heat, which you have to give up to the environment so your body temperature doesn’t get too high, Hackney says. The heat in the muscle transfers to the blood, which shuttles it to the skin; it can then escape into the atmosphere.