Former world boxing champion Mike Tyson shared a new training video.
Tyson, 54, posted on his Instagram account images of him strengthening his arm and leg muscles with blows.
"54 years old ... Incredible," "Brother, you're out of the chain, you can kill a man, why do you take such blows?", "How can this be?" wrote reviews like. However, some viewers said they were proud of his quick shots.