Jordan Milsom, who is returning to Oxford United as their new conditioning coach, admitted his switch to Swindon Town 12 months ago was a "big mistake".
Milsom was very popular with the players at Oxford and helped to improve their all-round stamina when he was previously their fitness coach.
But the Liverpudlian left a year ago to join Swndon when the opportunity came up to move to League One.
However, he says the set-up at the County Ground then was nowhere near as professional as at Oxford, despite United being two divisions lower.
He joined Sheffield United and had a spell out in China with the Blades' partner club, Chengdo Blades.
But he's thrilled to return to work again with United manager Darren Patterson, and will have nutritionist Jon Williams alongside him as well.
Milsom said: "Working in China was a good challenge and good experience. So it wasn't a wasted year, albeit when you go away from somewhere you realise what you had before.
"That was the big thing for coming back . . . this club's a fantastic club and I had the best spell of my career, by far, working here, so I jumped at the chance to come back and work here with these people."
He added: "Going to Swindon was just a big, big mistake. It's difficult to see Oxford in this division at the moment being as professional as they are, and working the way they are.
"It's a fantastically run club, everyone knows what they're doing and then you go to Swindon and everything is so wrong - and they're in League One.
"I can't comment on the current regime, but the previous regime (at Swindon) was diabolical. In my opinion, there was so much wrong on the sports science perspective. It was horrendous.
"It would have been a big challenge, but it was so unorganised, it was never going to work.
"I was told on one day that I was too oganised and I needed to stop being so organised! How you can work in that environment, I don't know.
"I knew from that day on it wasn't going to be right for me."
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