What’s the difference? Is one better than the other? Am I going to be able to do this with bad knees? Do I need to know how to dance

What’s the difference? Is one better than the other? Am I going to be able to do this with bad knees? Do I need to know how to dance
The Short Answer: “Bad knees” is a broad term, but in general, the more you can work your knees without jarring them, the stronger they will become and the less pain