The British boxer lost his world title in the first fight last year and admits that his strategy for the bout was wrong and changes will be made for the rematch - which is set to take place this summer.
Joshua explained: “The fight with Usyk, in my mind, was going for 12 rounds. That was my game plan because I thought I could compete with him as a boxer. And I think he won two more rounds than I did. That's how he became champion.
“So the goal now is to go back to basics and go for the knockout. I always feel, when I'm sparring or fighting people, I actually see their spirit get dampened. Honestly, when you're looking at this person directly in their eyes and watching their body, you can read the body and punch after punch this person is slowly fading.
"Now when you're boxing, the art of boxing is to hit and not get hit. So you're kind of boxing to stay away. That's not really my style. My style is to be up close and personal and make it difficult for the person. So that's the game plan."
Joshua also revealed that he hopes Tyson Fury abandons his retirement plans and agrees to fight him should he get revenge on Usyk.
The former world champion said: "If Fury was in the boxing arena, was to come out of retirement and honour the gentleman’s agreement, there’s a lot of money to be made."