Antonio Tarver has promised fight fans will see a different fighter then he makes his cruiserweight debut later this month.
The former light-heavyweight world champion will challenge Australian Danny Green for the IBO title on July 20.
Having lost back-to-back fights with Chad Dawson in 2008 and 2009, Tarver is rebuilding his career and last time out - in October - beat Nagy Aguilera at heavyweight when he weighed in at a whopping 221lbs.
Now preparing to fight at the 200lbs limit, Tarver said: "I'm in great shape, you're going to see my muscles, you're going to see me looking fabulously in shape and you're going to see a different fighter.
"I'm going to let my hands go like I did in most of my best light-heavyweight fights, when I fought guys like Glen Johnson the second time.
"When I let my hands go and I'm standing there toe-to-toe and boxing sort of like I did with Clinton Woods, I'm a hard guy to beat."
The American is not too bothered about Green, saying the Sydney fight will boil down to how he performs.
"I haven't watched any film on Green. I've seen some fights, but I let my trainers do that. I'm not worried about film because I can watch any film, and nobody he's faced looks like me.
"I don't get stuck on watching film too much because the last time I did that, it was against Eric Harding. By watching film I never thought that Eric Harding could ever beat me on my worst night, and it was one of my worst losses. I got my jaw broke, and I never did that again.
"I worry about me. I'm not really worried about Danny Green because he's got two hands and he can't throw but one at a time, and that's a simple thing to worry about - one punch at a time coming at me.
"He's not going kick me, he's not going to throw both hands, so I simplify it. We're going see what his best hands can do against my two best hands."
His trainer Jimmy Williams says Tarver is "sharp as he's ever been" at the age of 42.
Williams, who Tarver has returned to again having worked with him as a child, said: "he's been fighting for almost 20 years and it's still in him.
"I brought him back to the basics and fundamentals that got him to where he was.
"He's bigger than Danny Green, taller, and more experienced. The guy has no skills...we can run him."