Talking about playing musical instruments.

The first sentence only talks about the way flute and flute are played, and the second sentence "learning erhu will break your waist" mainly means that it is difficult to learn musical instruments. This sentence depends on who said it. If it is said by the teacher, it means it is not easy to learn any musical instrument well. To learn erhu well, we must be mentally prepared to "break the waist"; If scholars say this sentence, it is nothing more than venting the difficulties and feelings of learning art. I wonder if the landlord agrees?