Mike Tyson declared "I'm back" when he cut a menacing figure during an intense training session.

The heavyweight boxing legend raised eyebrows when he recently revealed his plans to return to the ring at age 53. He is open to charity fights 15 years after he retires.

Evander Holyfield, 57, said he would dispute a trilogy with Tyson, who looked in great shape when showing that he can still punch in an Instagram clip posted on Monday.