[4] In 2017, Henri Hooft left the Blackzilians and alongside Greg Jones, founded the gym, Combat Club in Boynton Beach, Florida.

[1] This was later rebranded as Hard Knocks 365 after moving the gym to Fort Lauderdale, Florida to accommodate a bigger facility.

[4] The team includes roughly 40 fighters, 25 of whom fight within the largest three MMA promotions (UFC, Bellator and ONE), as well as former and current world champions.

[3] However, after being scheduled to fight Kill Cliff FC teammate Gilbert Burns at UFC 258, Usman left the gym in June 2020 to join Trevor Wittman at ONX Sports in Denver, Colorado.

[7][8] In 2022, Usman returned to Kill Cliff FC to prepare for his title defense against Leon Edwards at UFC 278.