Fitness gurus from across Victoria will converge on Ballarat to compete in the epic two-day cross-fit competition. Following on from the theme of Anzac Day, the event will see 72 teams square-off against each other and compete across different categories of fitness.

Teaming up in pairs, they will carry each other through a series of challenges based around running, weightlifting, gymnastics and swimming in the hope of standing triumphant at the end.

Founder of the event Anthony Ebery said the whole idea is to test teams and individuals across all aspects of fitness.

"The theme of cross-fit is about being relatively good at everything to get you physically prepared for whatever life throws at you," he said.

"It's about having the ability to overcome anything at any given time."

Over 400 competitors and spectators are expected to turn out for the event which will run all day Saturday and Sunday.

Money raised on the day will be donated to the Mates for Mates organisation which supports current and ex-serving Australian Defence Force members coping with hardships related to their service.

Previous years have seen Diggers Oath Showdown raise over $2000 for the organisation and 2019 could potentially hold the biggest turnout yet.

This year's event saw organisers put a cap on numbers after spots sold out in quick time.

"It sold out in less than a day, it's phenomenally popular," Ebery said.

"We've created something that people want to be a part of and put in their diary each year."

The inspiration for the unique event came after organisers spoke to a number of ex-servicemen who shed light on the hardships some veterans suffer, particularly in relation to Post Traumatic Stress Disorder.

As such, the philosophy behind the event is designed to mirror the Anzac concept of "carrying your mates".

"The competition is designed to test the physical limitations of an individual and exploit weaknesses to highlight areas they need to go off and work on," Ebery said.

Ebery said cross-fit had grown rapidly in popularity in recent years. He said the competitive nature of the activity is similar to that of a sport, and for some it's their only form of fitness.

He said events such as the Diggers Oath Showdown have been made more popular through the friendships people forge after attending them.

The Diggers Oath Showdown will take place this Saturday and Sunday at Unit 9/903 Doveton Street North Ballarat. Doors will open at 8am and parts of the event will take place off-site at undisclosed locations.

Organisers have encouraged people to come along and see what cross-fit is all about.