Jaylen Brown has had quite the offseason.His 10-year run with the Boston Celtics, in which he won the NBA Championship in 2023-24, has come to an end.Brown has tried his hand at boxing during the NBA offseasonGettyBrown was traded to the Philadelphia 76ers in July, and has since made waves in viral workout clips alongside new teammates LeBron James and Tyrese Maxey.While the five-time All-Star is gearing up for his first year in Philly, with hopes of delivering LeBron one final title in what could be the icon’s last dance, he’s also taken some time to travel.Brown has traveled to Nigeria with his 7uice Foundation, where he has been supporting and connecting with local communities across the African country.However his offseason mission took an unexpected turn, as the former NBA Finals MVP stepped into the boxing ring.Jaylen Brown unprepared for boxing debut despite combat sports background A video shared on Instagram showed Brown throwing hands with a trainer to warm-up, before it cut to the former first-round draft pick in action, with quite a crowd behind him in Lagos.Details of the fight, and result, are scarce, but branding for the 7uice Foundation appears to be shown on the ring.Brown also offered an amusing insight in to the preparation — or lack of it — that went into the bout.“I did 0 prep for this,” he commented on the Instagram video.Combat sports, though, aren’t totally foreign to Brown, and is the son of a former boxing world champion.Brown’s dad Quenton was a professional fighter who fought 15 times between his debut in 1989, and his final fight in 2016.Brown stepped into the boxing ring in Nigeria, during a trip with his foundationGetty View this post on Instagram He was WBU champion in 2016 and WBU C.A.M. heavyweight Champion in 2015, while his grandfather Willie Brown is also a former professional boxer.Brown has also made headlines in the past for eyeing a switch from basketball to UFC, given he already trains in Muay Thai.“Just wanted to challenge myself in a different way, challenge my body,” he said of taking up the sport in an interview with Men’s Health back in 2024.“It’s being great for opening up my hips, which is great for defense, but also being able to stay low, have a greater balance, and being able to stay into certain positions for longer periods of time.“Muay Thai, the flexibility of it — also fighters train harder — and being able to incorporate that into my mind and my body has been great.”NBA fans worried over Jaylen Brown’s offseason adventuresWhile Brown has made it clear he feels at home in the ring, what his new team make of an offseason boxing match remains to be and 76ers fans are already less than impressed.Brown’s offseason activities have some fans worried about his return to the SixersGetty“If you’re getting paid $60m a year by an NBA team, maybe you shouldn’t be boxing,” one wrote on X, referencing his record-breaking salary.“Man’s out here doing side quests,” second said.“Is Philly cool with this? Season (starts) next month,” a third pointed out.“Interesting way to spend the offseason,” a fourth said.“Guess he isn’t trying to win another chip in Philly,” a fifth claimed.As some have pointed out, the new NBA season is just around the corner.The Sixers are set to begin training camp in late September, and will want Brown at the top of his game from Day 1.