Music has the ability to change heart rate./By changing heart rate.
题意：音乐如何使我们的心脏更健康?
根据第一段最后一句：Experts find that because of the wayour brains deal with music，learning to play an instrument or just listening to music can have plenty of benefits.（专家们发现，由于我们的大脑处理音乐的方式，学习演奏一种乐器或只是听一听音乐都有很多好处。）
并根据举例图片的右上角：Music has the ability to change heart rate.（音乐有改变心率的能力。）
可知音乐通过改变心率使我们的心脏更健康。
故答案为：Music has the ability to change heart rate./By changing heart rate.
