Hammer curls, a variation of the classic bicep curl, are highlighted as a valuable exercise for building functional arm strength and a defined physique. Unlike traditional curls focusing mainly on the biceps brachii, hammer curls employ a neutral grip, engaging the brachialis and brachioradialis muscles for broader arm development. The source details the proper technique for performing hammer curls in standing or seated positions and emphasises the importance of controlled movement and appropriate weight. Furthermore, it explores various hammer curl modifications using different equipment like dumbbells, resistance bands, and cables, offering versatility for workouts.