The dynamic duo taught locals how to swim faster through the introduction of high level skills and drills learnt at the elite level.

Swimmers also learn't how to maximise speed and power on their dives, turns and underwater.

The visit was funded by Dolly's Charity Shop.

"Our aim is to help the shire's individual young people and to support organisations to work with the youth," manager Gary Holland explained.

"So far we have raised $20,000 towards youth which is after 18 months."

The duo gave live demonstrations of each skill, drill, dive, turn and fast freestyle throughout the day.

Magnussen is an Australian swimmer and Olympic medallist. He was the 2011 and 2013 100-metre freestyle world champion, and holds the fifth fastest swim in history in the 100-metre freestyle.

Herzog debuted on the Australian team pretty late at the age of 23 years and claimed bronze at the 2015 world championships in Russia and missed out on the Australian team for the 2016 Rio Olympics by 0.2 seconds.

It was only through hard work that he then made the Dolphins team up until double shoulder surgery ruled him out of action shortly after he missed the team for Rio.

Herzog is still monitoring the progress in his shoulder, he hasn't given up aiming to be selected in the 200 metre freestyle for Tokyo 2020.

"It was very good; I could see the two Olympians were most professional in trying to give finer points to the swimmers," Holland added.

"A couple of the kids after it told me that they did learn new stuff and that they also honed in on things that they knew but weren't doing."