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Just under 100 competitors from around the South Island will travel to the city for the Clang n Bang.
In its second year, the event is being held at Crossfit Uncut, near the Oval.
It will begin on at 8am on Saturday and run all weekend. Finals will be held on Sunday afternoon.
While the competition itself promises to be a great one, the chance to compete at all is a big drawcard.
There are not many competitions in the South Island, one of the reasons this one was created.
''It's probably one of the biggest, if not the biggest, competition in the South Island,'' Crossfit Uncut's Lesley Proctor said.
''In the North Island there's more boxes and more population so they have more choice. But we don't get a lot of competition in the South Island.''
The event is capped at 100 entrants to make it manageable.
It is divided into various grades and includes teenage events, as well as open and masters.
The youngest competitor is 14.
Activities cover every component of fitness.
There will be work with barbells and dumbbells, running, gymnastics exercises on rings, bars and ropes, kettlebells and sand bag running.
The competition side of it was not for everyone and many preferred to use the ''functional fitness'' purely for training, Proctor said.
However, for those that did want to take it that bit further it would be a great opportunity.
Despite the lack of South Island competitions, it was not simply a case of more gyms starting them up though.
''Most crossfit boxes are quite small, so we've got the space that we can run a big competition,'' Proctor said.
''Also it's a huge amount of work.
''We've spent three weeks just literally planning and getting stuff sorted out. We'll have 40 to 45 helpers on the floor in the weekend.''