I think it is true because musicians do have to know their instrments and they have to know how to play it how to read the music or if you sing there is a lot more to it. and with athletes they have to have good strength and they have to understand whatever sport they play.
The answer to the question: Musicians must train their muscles to play instruments, just as athletes must train their muscles to play sports, is, false.
Explanation:
Musicians do not necessarily need to develop muscle mass in order to be able to play an instrument, because what they need is agility to be able to play them and their mental capacity, as well as their hearing skills. Instruments are usually pretty light, easy to handle, therefore to play them a musician only needs the agility of his/her fingers and limbs and his mental and sensitive abilities. Athletes abilities and skills do depend entirely on muscle mass as the power of their body, whether the rough, or refined skills, depend on the perfection of their muscle capacity. This is why the statement would be false.
