Is BJJ the hardest martial art?

Related questions

1. Do you need strength for BJJ?
2. What kind of exercise is BJJ?
3. What is the highest belt in Jiu Jitsu?
4. Is Jiu Jitsu good for fitness?
5. How many times a week should I train Jiu Jitsu?
6. Can you train BJJ everyday?
7. Why Brazilian Jiu Jitsu is the best?
8. How much does it cost to join an MMA gym?
9. Is BJJ a good self defense?
10. Who has a red belt in Brazilian Jiu Jitsu?

Tags

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3. #jitsu
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5. #belts
6. #martial
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13. #through
14. #black
15. #respected
16. #highly
17. #hardest
18. #brazilian
19. #acquired
20. #reason
21. #achieve
22. #other
23. #system
24. #where