1. Why did you all change your knees? Through the topic, I learned that the couple persisted for 10 years and walked as many as 10 thousand steps every day. This is a terrible amount of walking. It's just that in our daily life, walking too much will do some harm to our knees. Frequent walking will increase the wear and tear of the knee, which will lead to various problems in the knee over time. That's the main reason why the couple finally changed their knees.
2. How to walk healthily? How should we walk healthily? In the process of walking, don't be too radical, but walk slowly. With the support of a long journey, we should also have a proper rest. Don't go to rest without feeling tired, which will lead to knee damage. In daily life, you can also maintain your knees first through food, and often eat more calcium-containing food, which is very beneficial to your knees.
I hope my answer can help you.