A video of Joseph Parker's fists flying at speed while training with his coach has inspired awe among boxing fans.
The video was posted by coach Kevin Barry's son Taylor yesterday, with the message "too fast" and the hashtag #speedkills.
Social media users were quick to comment on the heavyweight's flurry of fists.
Jake Revill commented: "Effortless punches with so much speed and power its incredible. Any man willing to step in the ring with parker better get himself used to blunt force trauma. Parker will fold [UK heavyweight] Anthony Joshua in half!"
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Bob Sorensen said: "I bet Kevin has arthritis in his hands by now."
On Twitter, Martin Griffiths commented: "Joe has some serious speed for a heavyweight keep up the good work."
Parker's first fight of the year will be against American Jason Bergman in Samoa on January 23.