While you can't spot train to burn fat in specific areas of your body, you can tone your arm muscles and reduce fat through a combination of diet and exercise. Eating a healthy diet and burning more calories than you consume can help trim excess fat. Additionally, engaging in arm-toning exercises such as bicep curls, tricep dips and presses, lat pulldowns, pushups, diamond pushups, tricep kickbacks, plank sidewalks, arm circles, jabs, and opposite arm and leg lifts can help tone your arms.