Mike Tyson, 54, is training for his boxing comeback as he faces Roy Jones Jr, 51, on November 28.
Iron Mike revealed he has already shed six stone – but the work is not yet over for the heavyweight legend.
A fan captured the moment he saw Tyson – with car in tow – on a running session.
The shocked supporter calls out to the iconic puncher, who waves back.
It comes as Tyson prepares to box for the first time in 15 years.
He has been training since March and faces former four-division champion Jones in an eight-round exhibition.
Tyson has maintained the profits from his side of the pay-per-view spectacle will go to charity.
And that is what will inspire him to fight regularly once again.
Tyson said on the Joe Rogan Experience: “I believe this is just going to be the beginning, and whatever happens, happens in life.
“I’m just interested in fighting for the title of giving.
“It feels soul-cleaning for some reason.
“Doing it for myself doesn’t do it for me no more.”