MIKE TYSON revealed how he has started training again having not thrown a punch for a staggering 15 years - and is being aided by stem-cell research therapy.

The Baddest Man on the Planet, who hung up his gloves in 2005 following defeat by Kevin McBride, wouldn't elaborate on why he was having the treatment but added that it was 'really wild what scientists can do'.

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Tyson was having an Instagram chat with basketball legend Shaquille O'Neal when he revealed that he had been training for the previous three days after 15 years away - and his new health regime.

Iron Mike said: "You know what I had done? I had stem-cell research therapy.

"I feel like a different person but I can't comprehend why I feel this way. It's really wild what scientists can do."

Stem-cell therapy is the use of stem cells to treat or prevent a disease or condition that usually takes the form of a bone marrow transplantation.

He did not reveal what the exact condition was that was being treated.

Despite letting the gloves gather dust in the corner, it didn't take long for Iron Mike to show off that lethal punching power.

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The 53-year-old delighted fans in lockdown by uploading a viral video of him laying into a punchbag with his trademark speed and power.

Tyson's weight ballooned after retiring following battles with drug addiction and depression.

But he has since partnered with a new trainer, MMA coach Rafael Cordeiro, to kick-start his training after sensationally revealing his 15-year break.

During their chat, basketball legend O'Neal revealed how he ached for three days after playing with his sons.

Tyson responded: "That's just because you haven't done it for a while.

WHAT IS STEM CELL TREATMENT USED FOR?

Stem cell transplants are carried out when bone marrow is damaged or isnt able to produce healthy blood cells.

It can also be used to replace damaged blood cells as the result of intensive cancer treatment.

Here are conditions that stem cell transplants can be used to treat:

"If you continue to do it consistently you'll be back to normal.

"It's just like me, I haven't boxed or hit the bag for 15 years - it has been three days so far and I feel incredible."

Tyson, who has a 50-6 record, is reportedly gearing up for a sensational return amid plans to compete in exhibition bouts for charity later this year.

He told rapper T.I. last month: "I've been hitting the mitts for the last week.

"That's been tough, my body is really jacked up and really sore from hitting the mitts.

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"I've been working out, I've been trying to get in the ring, I think I'm going to box some exhibitions and get in shape.

"I want to go to the gym and get in shape to be able to box three or four-round exhibitions for some charities and stuff.

"Some charity exhibitions, make some money, help some homeless and drug-affected motherf****er like me."

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Mike Tyson, 53, reveals he had stem cell research therapy and hadnt hit bags for 15 YEARS before returning t - The Sun