Your arms are used mostly for what purpose when sitting properly on a motorcycle?

Your arms primarily assist in steering the motorcycle when you are seated properly. Proper arm position allows you to maintain control of the handlebars, contributing to overall stability and balance while riding. Control is crucial for safe maneuvering, especially in turns or when navigating obstacles.

While the other functions, such as braking, hand signals, and holding yourself up, are also important when riding, they are not the primary purpose of your arms when in the riding position. Braking is mainly managed by your hands through the brake controls, hand signals involve using your arms for communication with other road users, and holding yourself up relies on your core strength and positioning rather than solely on your arms. Therefore, steering is the most accurate representation of your arms' main function when riding a motorcycle.