Is walking up and down stairs bad for knees?

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Tags

1. #knees
2. #place
3. #muscles
4. #these
5. #running
6. #while
7. #placed
8. #problem
9. #first
10. #stairs
11. #adversely
12. #great
13. #affect
14. #entire
15. #activities
16. #heart
17. #unless
18. #should
19. #climbing