Billionaire and Meta co-founder, Mark Zuckerberg shared a selfie on his Instagram account showing off a new sporty achievement in his jiu-jitsu training. The 39-year-old founder of Facebook posted a picture of him with blackened eyes, an injury he sustained during his iu-jitsu training.Captioning the picture he wrote “Sparring got a little out of hand. May need to update my avatar 🤣” View this post on Instagram A post shared by Mark Zuckerberg (@zuck)Since being posted the selfie has garnered more than 4 lakh views on Instagram. Many netizens are reacting to the pictures and asking about his fight with Elon Musk, billionaire and owner of social media platform X.One of the users wrote “Nooooo who did this to you!” while another one said “Are you fighting Elon You might need to train with one my fitness routine 🔥🔥”“Might need to keep your hands up Mark,” the third user wrote.Elon Musk and Mark Zuckerberg rivalryNetizens are anticipating the big fight between the two tech giants, Elon Musk and Mark Zuckerberg after the former challenged the latter in May this year. The two were also supposed to hold a cage fight.In August this year, the SpaceX owner took to X to announce his fight with Mark but the fight has not yet seen the light of day.In view of the huge hype for the cage fight between Mark and Elon were also supposed to take their fight to the historic Colosseum in Italy, the place where gladiators used to fight back in the days. Musk had announced on X that the fight would have been streamed on X and that all the profit would go to charity.Zuck v Musk fight will be live-streamed on 𝕏.All proceeds will go to charity for veterans.— Elon Musk (@elonmusk) August 6, 2023Zuckerbergs fitness routineThe Meta CEO in an interview last year, said that he attempts to do at least two hours of daily physical activity. He also said that he has been training in martial arts since the pandemic hit 2 years ago. He said that the sport gave him an energy boost. The billionaire trains with coach Dave Camarillo. The fight between Elon Musk and Mark Zuckerberg is still being highly looked forward to, even though it has been five months since the fight was announced.