HEAVYWEIGHT Anthony Joshua revealed his strategies for Saturday's clash with Oleksandr Uzyk for the world title.
He believes that the unbeaten Ukrainian opponent will be his most difficult to beat.
Sky Sports interviewed AJ about Usyk's biggest challenge in his career, before explaining his approach to the fight.
Joshua, 31, stated that movement means that you're never stationary to be hit. It is vital to move.
"Concentration is when you want [punch], then you lock in and then you make a move. Your brain must work properly.
"It can be mentally exhausting, so I am working to sharpen my mind in order to concentrate for the 12 rounds.
"I also practice the ability to [punch] four or more times. Take your time, concentrate, and pin him down.
It's a battle for the brain. It's important to know what is in front of your face and how you can deal with it.
BETTING SPECIAL - GET JOSHUA TO WIN IN ROUNDS 1-6 AT 60/1 OR ANYTIME AT 25/1You can be aggressive, corner [him], or throw everything at him. You can also be patient, clever and knock him out.
Joshua is expected to retain his world title, but Usyk, 34 years old, has never lost an amateur fight and has an 18-0 record.
"The Cat", as he is known, was the first cruiserweight to ever hold all four major world championship belts before moving up to heavyweight.
Already Usyk has two big British wins on his resume, defeating Tony Bellew in November 2018 as well as edging Derek Chisora during his last fight.
AJ doesn't let his opponent's record fool him and has been training hard to prepare for the fight.
British star said: "I do consider my weight, but I'm not trying make weight, because I'm a heavyweight."
"I customize my training. I have a lot of experience. I've been fighting great fighters for a while, and I've learned about their training camps.
"I have learned how to prepare my body for certain fights. This fight is going to be a tough one for me.
Joshua and Usyk: All information about the TV, stream, and undercard ahead of Saturday's heavyweight fight
"I am fighting a 12-round fighter. It would be foolish of me to go into the ring bulky and my muscles screaming for oxygen.
"I have been training in this camp like a fighter for 15 rounds. I'm well-conditioned for fighting. This is the key.
What happens when I train this way? My body adapts to the environment and takes its natural form. This is the body it has taken."
