What is the hardest martial art to get a black belt?

Related questions

1. How many times a week should I train Jiu Jitsu?
2. What is the highest belt in Jiu Jitsu?
3. Is BJJ a good way to lose weight?
4. How long does it take to get blue belt purple?
5. What age can you start BJJ?
6. Does BJJ improve cardio?
7. Is BJJ a good self defense?
8. How much does Jiu Jitsu cost?
9. How many times should you train a week?
10. Do you need strength for BJJ?

Tags

1. #level
2. #contact
3. #stand
4. #jitsu
5. #sparring
6. #amount
7. #takes
8. #brazilian
9. #black
10. #demands
11. #demanding
12. #martial
13. #their
14. #highest