In the meantime, some affected members who want their gyms changed back to the Club Physical brand plan to hold a protest outside one of the new Jolt Fitness clubs.
Jane Haggo, who signed up to Club Physical in Westgate about 15 years ago, said she and other members were angry they were given no warning about the change.
"I'm paid up 15 months in advance but I don't want to go to this new gym because they don't offer the classes I want," she said.
"I now use the Te Atatu and Albany branches which are really out of the way for me."
A protest would take place in the carpark outside Jolt Fitness at Westgate, in west Auckland, at 9.30am this Sunday, she said.
"This is wrong on so many levels but our primary reason for protesting is in support of instructors that have lost their classes and their livelihoods because of this, I think it's unacceptable what's happened."
Haggo said she, other members and instructors started talking in the locker-rooms and decided they wanted to take action.
They hoped a protest would send a message to Jolt Fitness that many members were opposed to the change.
"This whole thing has been done by foul means. We want to see justice done," Haggo said.
A poster promoting the event had been put up in some Club Physical gyms and was also being shared on social media.
About 90 to 100 people were expected to turn out for the protest but it was hard to predict exact numbers, she said.
Stuart Holder, who owned the three branches under a franchise agreement, said he rebranded the clubs to ensure their survival.
"As background, on Friday 8, February we regrettably had to take steps to end our franchise agreements with Club Physical in Westgate, Botany and Three Kings because we believed the franchisor had not been meeting its obligations to us and that this was putting the future of the clubs - your clubs - in jeopardy," he told members in an email last week.
Club Physical owner Paul Richards alleged Holder had breached franchise agreements that had "years to run on them".
Late last week, Richards entered an application to the High Court seeking an injunction to block Jolt Fitness from trading.
Lawyers for both sides appeared yesterday to discuss the application before Justice Rebecca Ellis, who directed an urgent, half-day fixture be scheduled in next week for the case.
Richards today said if he was not able to block Jolt Fitness from trading he would like to open new gyms in those three locations.
"We've just started looking and we've got a couple of offers on the table.
"Two different people we know have got property in those areas and have offered to put gyms into them. We'll see what happens in court first."
The hearing will take place at the High Court at Auckland next Tuesday February 26.