Do planks work?

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Tags

1. #efficient
2. #floor
3. #lower
4. #against
5. #later
6. #exercise
7. #encompassing
8. #muscles
9. #activate
10. #pushing
11. #cause
12. #additionally
13. #require
14. #entire
15. #making
16. #planks
17. #workout
18. #spine