So, here’s how to lose arm fat: Stand holding the dumbbells at your side, palms facing forward. Your posture and form is important, so keep your back straight and chest up. Lift your arms straight up until they’re at a 90-degree angle to your trunk. Now curl the weights to your shoulder as you count to three, then straighten to a count of three. Lagree recommends doing three sets of 20 repetitions. Don’t miss this 15-minute strength training routine that works your whole body.
HOW TO DO IT: Start with your left leg forward and your right leg back. Place your left foot onto one end of a towel and grab the other end in your right hand. Pull the towel as hard as you can without holding your breath. Hold for 30 to 60 seconds, then switch sides and repeat. If you can’t maintain the hold continuously, break it up into shorter five- to 10-second bursts with brief one- or two-second rests in between.
You'll also build muscle to fill out your arms and firm them up. “Generally, when people are complaining about underarm jiggle, they’re usually referring to the area that is governed by the tricep,” says Williams. “If the jiggle or looseness in that part of your arm is due to a lack of muscle, then strengthening and building muscle in your tricep will also create some change in the aesthetic of that area.” She recommends performing triceps push-ups, extensions, and dips to hone in on that area and add some muscular definition to your arms.
Bend your knees to lower down into a split squat. Your left knee should ideally form a 90-degree angle so that your thigh is parallel to the ground, and your right knee is hovering above the floor. (Quick position check: your left foot should be stepped out far enough that you can do this without letting your left knee go past your left toes—if you can't, hop your left foot out a bit farther away from the bench.)
Start by placing a chair on a sturdy surface against a wall with the seat facing towards you. You can also do tricep dips on the edge of a staircase (such as the 2nd or 3rd step from the bottom) or a workout bench. Stand 1 to 2 feet (0.30 to 0.61 m) in front of the edge of the seat of the chair. Place your hands behind you, shoulder width apart with your fingers gripping the edge of the chair. Bend your knees so they are at a 90-degree angle and your knees are directly above your ankles.
Your post-work meals should be high in protein and carbohydrates and you should always eat within 2 hours of your workout. A meal like low-fat Greek yogurt with a few tablespoons of granola and fruit or a peanut butter and banana sandwich made with 1 slice of whole grain bread can help your body to recover after a workout and improve your muscle strength.
Previous studies from her lab have also shown that the exercise is linked to changes in the secretion of stress hormones like epinephrine (a.k.a. adrenaline) and norepinephrine. “Our work has shown that each moderate, relatively short exercise bout exerts regulatory/suppression effects over inflammatory activities of immune cells," says Hong, "and in order to maximize this ‘benefit,’ repeated and regular exercise is recommended. In fact, we have also found that higher physical fitness is associated with better regulation of inflammatory activities of immune cells through stress hormones even among obese individuals.”
“Exercise of various types can help prevent osteoporosis, thinning of bones, fracture risk, and falls that are associated with fractures of the hip, spine, and wrist,” says Larry McCleary, MD, retired acting chief of neurosurgery at Denver Children’s Hospital in Colorado, and author of Feed Your Brain, Lose Your Belly. “Types of exercise that help include aerobic exercise, resistance training, and even exercises that increase balance and agility.” Tai chi may also be beneficial when it comes to improving balance and muscle strength.
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.