How hard should I workout to gain muscle?

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Tags

1. #fewer
2. #should
3. #reach
4. #choose
5. #between
6. #failure
7. #heavy
8. #which
9. #endurance
10. #building
11. #muscle
12. #weight
13. #build
14. #emphasizing
15. #aside
16. #allows
17. #strength