Paul Smallman, aged 35, from Cannock has been a driver on the National Express Birmingham to London route for the last six months.
At 16 stone he struggled with the dance routine and came close to quitting.
"I'd never really danced except at family parties. My two lads, Ryan and Jamie, tell me: 'you can't dance, you're embarrassing.' I thought, go on then, I'll have a go. I'll show them!
"I'd seen clips of Irish dancing on the TV and I thought it would be a bit of a laugh. What I didn't realise was how unfit I was.
"I've been driving buses and coaches for ten years, I hadn't been getting any exercise and when you are working long hours, driving long hours, I'd just come home and eat whatever was around.
"As soon as we started doing the dance classes I felt it. Every joint was aching, everything hurt, muscles I didn't know I'd still got.
"At the end of the first week I was ill with the exhaustion of it. I had to have a day off and I think I slept for 24 hours.
"About half way though I was thinking about pulling out. It was exhaustion and nerves. I just couldn't seem to get the moves right.
"But I had a chat to my other half and came to the conclusion that I couldn't throw it away and let everyone down.
"Me and another lad who was struggling started working together after the classes. We practised on the patio and in the driveway at my house. People were walking past thinking what are those two doing, but we didn't mind. We just wanted to get it right.
"Right up to the last minute you were thinking 'are we going to pull this off' and we did. I'm so glad I agreed to do it, I had a tremendous time. It has given me more confidence and we have all got a lot more respect for each other. I'd say it was one of the best experiences of my life."