https://youtu.be/_pHBDE4G6wI
This clip may be an older one, but it’s still extremely interesting.
Glory Kickboxing welterweight champion Nieky Holzken visited the Blackzilians gym earlier this year to share some knowledge.
He taught former UFC champion Vitor Belfort some things, and sparred with UFC lightweight Michael Johnson, nearly finishing Johnson.
Check out the clip above!