It has been described as feeling like an electric shock. That is what it is like to be hit by the boxer known as 'the Monster'.
One of the most feared punchers on the planet stands at 5ft 5in and weighs less than 9st. That man is Japan's Naoya Inoue.
On Saturday the four-weight world champion and two-division undisputed king will attempt to defend his super-bantamweight titles against compatriot and three-division champion Junto Nakatani at the Tokyo Dome.
Inoue has stopped opponents 27 times in 32 wins and put foes down on the canvas on more than 45 occasions.
Along with Oleksandr Usyk, he is one of the greatest fighters in the world.
Speaking to those who have fought him, BBC Sport finds out what is it like to face Inoue.