Does holding a flex build muscle?

Related questions

1. How does flex time off work?
2. What happens if you flex too hard?
3. What happens if you flex your muscles too hard?
4. Does tensing your stomach tone it?
5. Should you flex between sets?
6. How do you flex your legs?
7. What does Sutile mean?
8. What is a weird flex?
9. What does Flex mean in slang?
10. Are flex credits taxable?

Tags

1. #joint
2. #enough
3. #strength
4. #which
5. #angle
6. #flexing
7. #reason
8. #exercise
9. #during
10. #physique
11. #although
12. #because
13. #length
14. #training
15. #amount
16. #contraction
17. #isometric
18. #muscle
19. #build
20. #alone
21. #change
22. #impressive