Floyd Mayweather looks to the past for huge Manny Pacquiao fight in Las Vegas
Floyd Mayweather has turned to "throwback training" in the belief it will take something special to defeat Manny Pacquiao at the MGM Grand in the early hours of Sunday morning.
Mayweather has been chopping 700lb tree trunks to enhance his conditioning for the richest fight in history.
The 38-year-old abandoned the Rocky-style technique after becoming estranged from his father Floyd Mayweather Snr, who returned to his corner in 2013 and has overseen preparations for Pacquiao.
"I want to win. I really want to win and mentally I have to go back to where it all started from because he's not just any other fighter," Mayweather said.
"I don't think like there's anything I can't accomplish and that's why I'm pushing myself to the limit right now.
"I'm going back. Throwback training... I have to go back to where it all started from. I have to go back to day one. Chopping wood, it's the best for you.
"It all started with the sledge hammer when I was 10-years-old. And then when I was 13 or 14, I started chopping with the axe.
"My dad showed me how to chop and throughout my amateur career I used the axe. I stopped using it when I started training with Uncle Roger because me and my dad weren't seeing eye to eye."
The most lucrative clash in boxing history is expected to generate in the region of £332m with Mayweather taking £100m, a sum that will translate to the highest annual earnings for any athlete barely five months into the year.
Mayweather, nicknamed 'Money', is the favourite but Pacquiao would be a more popular winner.
However, the pound-for-pound king views the reality that many fans want to see him fail as subordinate to his pursuit of wealth.
"I believe in self-preservation. Me first, then everyone else. But me first. Nobody is going to love Floyd Mayweather like Floyd Mayweather," Mayweather said.
"Whether you pay to see me win or pay to see me lose, you're paying and I'm collecting."