08/17/2026
A man on a mission. When John T Costello III started training at Southpaw, I don’t think he ever imagined stepping into the ring — let alone going pro. On Saturday, John won his professional debut with a first-round knockout. 🥊
The journey was anything but easy. The last six weeks of full fight camp broke him a few different times (if you know, you know 😂). There was literally blood, sweat, and tears. There were moments he didn’t think he’d recover and honestly, some where his team thought the same.
Boxing is humbling. But it proves that you can accomplish anything when you put your all into it. Your heart can take you to great places.
Congratulations to John — not just for an incredible win and the courage to step through those ropes, but for every sacrifice he made to get there.
A huge shoutout to Team Southpaw! Our volunteers, training partners, and members who stuck with and pushed John every single day. The love and respect we have for each other is what makes this place special. Southpaw Strong 🥊