FLOYD MAYWEATHER'S kickboxer Tenshin Nasukawa opponent almost collapsed in an incredibly brutal training video.
The Japanese star, 20, can be seen being put through his paces, getting visibly more drained as the clip goes on.
Starting off in what appears to be an octagon, the kickboxing ace attacks a pad with real venom.
After a long sequence punching and kicking the body-sized pad, the clip moves on to him in a boxing ring.
Getting things underway with equal vigour, Nasukawa quickly beings to tire and even hits the deck at one stage in exhaustion.
Throwing himself back to his feet, the Japanese fighter can barely muster up the energy to throw a punch or aim a kick as he meekly attacks the pad.
The footage has come to light just eight weeks before the two men will go head-to-head in Japan on New Year’s Eve.
Money has announced he will be coming out of retirement - boasting a career 50-0 record - to take on the undefeated brawler on December 31.
And the boxing legend will face a huge challenge to begin his latest combat sport career with a victory.
Nasukawa is the current RISE featherweight world champion and is ranked eighth No8 bantamweight in the world by Combat Press.