The 30th Swimarathon organised by Lytham St Annes Lions has already set a new record.
The number of teams of eight taking part this year will be a best-ever 58, beating the previous record of 54 set last year.
A target of £15,000, which would itself be a record, has been set for this year’s event, which takes place at St Annes YMCA Pool on Sunday, January 31.
The cash raised via sponsorship will go towards funding health advice for primary school pupils as well as heart screening for more young people after 200 were checked last year by the Cry (Cardiac Risk In The Young) organisation.
The Lions have already reserved dates in May for the screenings.
The Swimarathon has raised around £200,000 for various charities since first staged by the Lions in April 1987.
That includes some £30,000 over the last three, which has seen the focus put on aiding cardiac health, including funding defibrillators for local schools.
Lions spokesman Colin Holt said: “We are absolutely delighted with the response this year. To beat the previous record number of teams is wonderful and it’s fingers crossed that we will be able to reach the £15,000 target.
“The Swimarathon has a long tradition of people rallying round to support our efforts to raise money for charities and it has been especially pleasing in recent years to see the way swimmers of all ages have backed our efforts to help improve the health of health of young people.
“This 30th year is a very special landmark for the event and a record amount raised would be the ideal way to celebrate - so thanks to everyone for their support and we look forward to a memorable day.”