They are aged from 18 to their mid-50s and Martin says they have varying degrees of fitness. Peer pressure is keeping everyone on track. None has dropped out so far.
"It has huge benefits in team cohesion," Martin says.
Foodstuffs supervisor Andy Cheale, one of the bodybuilders, agrees.
"There is more productivity because the guys can stay focused for longer periods and it's good team building," he says.
"We took a small number from each department, which forces interdepartmental relationships."
He says some of the men are in quite physical jobs in which they lift thousands of boxes a day, so being physically fit is a big help. "If you're doing heavy lifting, it makes sense to stay fit."
Murray Jordan, Foodstuffs Auckland's managing director, says the business has a number of initiatives to help employees maintain their health.
"The fact that the team from the distribution centre have gone that extra step and taken up bodybuilding training is fantastic," he says.
"As a result, they have seen significant changes in overall body mass, as well as the positive and lasting changes they have made to their entire lifestyles."