Why is MMA and boxing the hardest sport in the world?

[sportsbyte]

According to world ranking, MMA and Boxing is considered to be the most hardest sports in the world. Because players need to be highly skilled for these sports. Plus, these sports demand hours of practice, even professional players start these sports from childhood. These sports are the fighting competitions and have the risk of serious injuries and high risk of life. But, besides these issues, these are very popular as sports.
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