She voiced concern over the effect such a message could have on children and called for the poster to be removed and "replaced with something more tasteful to attract the gym goers."
READ MORE: • Do you think this ad is racist?
Despite Harvey's position and pressure to remove the ad from the store where the poster resides, the gym isn't coming to the party.
Jan Spaticchia, chief executive of the gym's parent company Energie Group, said: "The aliens campaign is actually very successful.
"We aim to get people talking and promote the notion of a healthy lifestyle.
"We don't take ourselves too seriously. I'm a 45-year-old man who is 17.5 stone and proud of it but I'm healthy with it."
He said while the company didn't mean to cause offence they also believe they can reach more people if they take a less serious approach.
"We need to be willing to poke fun at ourselves and our messaging is designed to do exactly that.
"We have found that by taking a lighthearted approach we can connect with more people who would enjoy what we have to offer. It's a little harmless fun."
- nzherald.co.nz