The fitness challenge was issued by CrossFit2650 and gave participants the opportunity to increase their fitness while raising funds for the flood-ravaged North Wagga Public School.

Four weeks ago more than 60 residents, many of whom had never experienced CrossFit, completed a workout and recorded their personal achievements in each exercise.

After a month of classes and support from CrossFit2650 instructors Kym Newton and her husband Adam, the participants returned on Saturday to complete the same workout and gauge how much their fitness and health had improved in that time.

The participants, who paid $25 to enter the competition, raised more than $1200.

"The beauty about CrossFit workouts is that they can be scaled to allow for different fitness levels, so we have beginners through to advanced participating in the competition," Ms Newton said.

"Confidence is a big thing, some people come in the first time a bit shy about giving something new a try.

"Everyone makes them feel welcome."

While Ms Newman said not all the participants of the fund-raiser had attended the classes, some learnt the CrossFit exercises and incorporated them into their own fitness programs, she said the results were pleasing and it had been exciting to share in the participant's achievements.

"Some people have seen their body change," Mrs Newman said.

"(They've) lost centimetres, pants are looser, they have more energy, they are getting through the day and not hitting the three o'clock wall."