UFC fighters are sharper & better prepared when they spar hard in MMA gyms like Kings MMA under Rafael Cordeiro.

But the hard sparring can lead to greater number of injuries and hard blows to the head.

Which can (in theory) shorten an athletes career.

There are MMA gyms known for sparring hard while others are known for light sparring.

There are also some coaches in MMA who are considered very good, while others are considered very bad.

Changing teams can make a huge difference in an athlete's performance.