Are runners happier?

Related questions

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4. Does running with your arms behind you make you faster?
5. Why does running make you poop?
6. Does running with weights make you faster?
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Tags

1. #regularly
2. #health
3. #image
4. #happier
5. #research
6. #caledonian
7. #person
8. #positive
9. #mental
10. #makes
11. #running
12. #according
13. #confident
14. #having
15. #glasgow
16. #university
17. #their
18. #impact
19. #runners