Are planks bad for lower back?

Related questions

1. Can leg raises reduce belly fat?
2. Do lying leg raises work?
3. Can exercise make your buttocks bigger?
4. Do leg lifts burn leg fat?
5. What causes hips to widen?
6. Do hanging leg raises work abs?
7. How many hanging leg raises should you do?
8. What are the benefits of side leg raises?
9. Do leg lifts slim your thighs?
10. How long should I hold a plank?

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2. #reduce
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5. #helps
6. #plank
7. #requires
8. #minimal
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11. #section
12. #movement
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14. #tightens
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16. #muscles
17. #abdominal
18. #contracting
19. #strengthen
20. #become
21. #layers