BEIJING, Dec. 28 -- It turns out training your robot to kick can be a painfully dangerous affair.

A China man who goes by the moniker zeonsunlight on Bilibili demonstrated a robot mimicking movements, much like motion capture but instead of it being a virtual sprite on screen, it was a robot.

The man went through what looked like martial arts moves including kicks but made the mistake of getting too close to said robot - thus an unfortunate and painful kick to his unprotected lower region.

In a description of the clip, the man humorously advised users to protect their testicles, saying: "This video documents an algorithm development experiment. Robots are dangerous-everyone, watch your nuts."

Making a nod to the video's popularity (it...