The dumbbell Arnold press is an upper-body strength exercise, created by bodybuilder Arnold Schwarzenegger. To do it, you lift dumbbells over your head, working muscles like the deltoid, triceps, and trapezius. Beginners should be cautious as it targets advanced fitness levels. To perform it, stand with feet shoulder-width apart holding dumbbells at shoulder height. Rotate your palms to face your body. Press the dumbbells overhead while rotating your palms forward. Return to the start position by reversing the motion. Benefits include improved shoulder strength and stability, enhanced posture, and better upper-body muscle activation. Common mistakes include using too heavy weights, incorrect wrist position, and arching the back. Always use proper form to avoid injury.