Which muscle should be massaged to help straighten the wrist and align the fingers?

The extensor muscles are crucial for straightening the wrist and aligning the fingers. These muscles are located on the posterior side of the forearm and are responsible for the extension of the fingers and the wrist. By massaging the extensor muscles, you can help promote flexibility and proper alignment of the fingers while also relieving tension that could be caused by overuse or strain. This makes the extensor muscles key players in ensuring that the fingers are correctly positioned and can function properly during activities such as manicure services and daily tasks.

In contrast, the other options involve muscles that do not primarily assist with the extension of the wrist or fingers. The flexor muscles, located on the anterior side of the forearm, are responsible for bending the wrist and fingers. The biceps and triceps are primarily involved in bending and extending the elbow, respectively, and while they play a role in overall arm movement, they are not directly responsible for the specific action of aligning the wrist and fingers. Therefore, focusing on the extensor muscles is the most effective choice for achieving the desired outcome.