Why does my back stiffen up when I walk?

Related questions

1. Should you do back exercises everyday?
2. Is Climbing good for your back?
3. Are planks bad for your lower back?
4. Who is the most powerful superhero ever?
5. Is walking good for lower back pain?
6. Do Superman's work your back?
7. Is Climbing stairs bad for lower back?
8. Why my lower back hurts when I walk?
9. Is Captain Atom stronger than Superman?
10. What is the best exercise for back pain?

Tags

1. #walking
2. #problem
3. #which
4. #other
5. #important
6. #condition
7. #allowing
8. #cause
9. #anatomic
10. #following
11. #easily
12. #upright
13. #running
14. #lifting
15. #usually
16. #missed
17. #lower
18. #hyperlordosis
19. #caused
20. #during
21. #spine
22. #activity
23. #posture
24. #correctable