Are planks dangerous?

Related questions

1. What causes hips to widen?
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3. How long can the average person do a plank?
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5. Are Side leg raises effective?
6. Do leg raises give you abs?
7. How many squats should I do a day?
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Tags

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2. #doing
3. #manner
4. #abdomen
5. #flatten
6. #cause
7. #incorrect
8. #people
9. #become
10. #injury
11. #dangerous
12. #popular
13. #planking
14. #years
15. #practice
16. #muscles
17. #trainers
18. #recommend
19. #strengthen