Kiwi gyms are being warned to shape up or face prosecution after an investigation found some gyms may be breaking consumer credit law.
The Commerce Commission says it has investigated membership contracts at 13 gyms across the country and found consumers in all but one of those cases weren't being made aware of the true cost of their contract.
The contracts failed to advise customers of their statutory right to cancel the contract, and failed to disclose the full cost of the membership for the minimum period, the Commerce Commission said.
The investigation was prompted after some consumers complained about the difficulty and, or expense they had when trying to cancel their membership.
Commerce Commission competition branch manager Graham Gill said it was fundamental that consumers were given full information with signing with a gym and is warning gyms to 'shape up'.