The unit is perched on an concrete floor, out of sight, above a welding company.
But in these humble surrounds, 130 boys and girls train every week, learning boxing, fitness, nutrition and life skills.
And this week the Fitness Factory Amateur Boxing Club, from modest beginnings, is celebrating its 10th birthday.
The Star helped the club mark the decade by attending two training sessions.
Head of Sport Bob Westerdale was on hand to present a loyalty prize to local youngster Louie Pilgrim, who has been a member of Bill Gavins' gym every day of its existence.
He has taken part in most of the boxing drills, circuit training, and boxercise classes.
Gavins said the centre at Holbrook Industrial Estate at Halfway had been a fantastic success.
"In the area, at the time, there were no boxing clubs available and you had to travel to the other side of Sheffield to accommodate boxing.
"So we thought we'd open the doors and see who would come.
"We operate with the ethic that is is an all-inclusive club, it doesn't matter if you are going to be a world champion or not."
Gavins, who admits he was influenced by the tried and tested methods of Brendan Ingle and Glyn Rhodes, said youngsters are encouraged to achieve the very best they can.
He said their achievement is the way kids continue to come to the gym every week, despite other factors in their lives.
Asked if he and other trainers like boxer Lee Connelly could be guiding a next generation Kell (or Kelly) Brook, he replied: "We do have a couple of really good competitive boxers who work so, so hard" he added.
"Over the years we have had Yorkshire champions galore, lots of area champions, who knows whether they carry on or they don't."