The three YMCA aquatic centres in Port Stephens, Tomaree (Salamander Bay), Tilligerry (Mallabula) and Lakeside (Raymond Terrace), will host Swimathons on March 1. All money raised by entrants would go back to the centre they nominate to receive their funds.

The funds raised would go to supporting the less able in the community and empower others to get more people in the water.

"Last year we were able to provide swimming lessons for the special education unit at Tomaree school and send an instructor to become a qualified swim teacher," Tomaree Aquatic Centre's Charli Robinson said.

"The money raised goes to helping disabled people swim and to qualify instructors to work with disabled children.

"We were also able to offer half price swimming lessons for people with a disability last year."

Ms Robinson, who is co-ordinating the Salamander Bay pool's Swimathon, said swimmers raised $6000 last year.

The day itself was designed for swimmers of all ages, competitiveness and capabilities.

Families who enter would often challenge each other with how many laps they could swim.

Ms Robinson said it was not uncommon for people who were not great at swimming to enter and challenge themselves.

To register go to ymcaswimathon.org.au.