Is a half Ironman harder than a marathon?

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Tags

1. #think
2. #things
3. #equal
4. #forum
5. #faster
6. #being
7. #physically
8. #marathon
9. #demanding
10. #because
11. #ironman
12. #normal
13. #harder
14. #walking
15. #running
16. #people
17. #slowtwitch