Johnny Nelson is back in action, but this time it’s not in the ring. The former world champion steps into UBX Hammersmith to take on a full 12 rounds of circuit training, pushing his fitness, endurance and mental strength to the limit. Teamed up with Richard Maynard, Johnny goes through a relentless mix of pad work, heavy bags, weights, pull-ups and more, in a session that doesn’t let up from start to finish. Led by trainers Kain Tippett-Wilson and Gabriele, this is a proper test of what it takes to go the distance, even for a former champion. Can Johnny still go 12 rounds, or will the UBX circuit break him? Let us know in the comments, could you last all 12 rounds? Subscribe to Seconds Out for the latest boxing news: http://goo.gl/meA2GB Follow on Twitter: http://goo.gl/VDYVMP Like on Facebook: https://www.facebook.com/secondsoutlive Follow on Instagram: https://www.instagram.com/secondsoutlive News website: https://www.secondsout.com/