What muscles in your hands are used in playing a piano?

Playing the piano primarily engages the muscles of the hands and forearms. The intrinsic muscles of the hand, including the lumbricals and interossei, facilitate finger movement and coordination, while the extrinsic muscles, originating from the forearm, control finger strength and dexterity. Additionally, the flexor and extensor muscles play a crucial role in finger flexion and extension, allowing for precise key strikes and dynamic expression. Overall, a combination of these muscle groups works together to produce the intricate movements required for piano playing.