Which example is associated with the brachialis?

The brachialis is a key muscle involved in elbow flexion, located beneath the biceps brachii. It plays a crucial role in various lifting movements, and the reverse arm curl directly engages this muscle. In a reverse arm curl, the palms face down as the individual curls the weight, which emphasizes the brachialis more than other elbow flexor muscles due to the unique grip position. This movement minimizes biceps involvement, thereby isolating the brachialis effectively.

While the other options may involve arm movements, they do not specifically target the brachialis in the same way. For instance, the hammer curl, although it also works the brachialis, engages the biceps brachii significantly as well due to the neutral grip position. Diagonal knee raises focus primarily on the hip flexors rather than the muscles of the arm. Wrist curls primarily target the forearm muscles rather than the elbow flexors. Hence, the reverse arm curl stands out as the most directly associated with activating the brachialis.