Former sumo wrestler Akebono admits he's worried about his upcoming K-1 debut against former NFL lineman Bob Sapp but knows there's no turning back now.

News photoFormer Yokozuna Akebono stretches during a workout early this week at a Tokyo gym in preparation for his K-1 match against Bob Sapp next month in Nagoya.

"Sure, this is a totally new experience for me so I'm worried about everything," Akebono said Wednesday after a training session in Tokyo.