Sergey Kuzmin caused controversy at the weekend by uploading a video of himself knocking a sparring partner out cold.

The Russian heavyweight has since deleted the clip – already shared and viewed by thousands – in which he lands a stunning right hand to flatten his foe.

🇷🇺 Russian heavyweight Sergey Kuzmin posted this video of himself knocking a sparring partner out cold today… [🎥 Sergey Kuzmin] pic.twitter.com/T5osJ9mcwu — Michael Benson (@MichaelBensonn) January 4, 2020

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Although in some gyms it is not unusual for footage such as this to be made public, most fighters and trainers believe what happens in sparring should be kept private.

As a result, Kuzmin came in for plenty of criticism for his decision to upload the video and decided to take it down as a result.

The 32-year-old was recently floored himself in the ring by Michael Hunter and went on to lose by unanimous decision.

Getty 1 Kuzmin beat Price on the Joshua vs Povetkin card

This defeat was the first of Kuzmin’s career and he will be looking to rebuild in 2020.

The former European amateur heavyweight champion holds a win over David Price within his 15-1 record.

You can read a round-up of the reaction to the video below.

Sparring stays in the gym… this is WEAK — Lenny (@Lenny38503784) January 4, 2020

Imagine sparking your sparring partner out cold and not going to check if he was OK. https://t.co/q32Jbx6itv — Phobes (@PhobzLittleCity) January 5, 2020

Shows a massive lack of class from him — Ryan ⚓️ (@Ryan_1882) January 4, 2020

He certainly knows how it feels.. 👍 pic.twitter.com/OzwDQda0Ln — Luke (@Luketuc57920589) January 4, 2020

What happens in sparring stays in sparring. Except when you can post it on social media for likes 🤷‍♂️ https://t.co/8EnIr4TpBS — Tom @ UKFightNight 🥊 (@UKFightNight1) January 5, 2020

Its XXXXXX up for him to post this… what happens in the gym is supposed to stay in the gym!!!!! — ICEMANJohnScully (@IceJohnScully) January 4, 2020

I understand posting a knock down but this guy is out cold. Definitely not cool! — Ashley Theophane (@AshleyTheophane) January 5, 2020

Sparring happens in the gym and stays in the gym imo. https://t.co/zqUHjB9bYK — Warner (@warner_halbesma) January 4, 2020