The annual Swimarathon for teams of up to six people, provide lots of fun, friendly competition and camaraderie. 

 The first "RotarySwimarathon" took place in February 1990 with the aim of raising monies for local charities and deserving causes in and around Grantham, it was a great opportunity for members of the club to showcase their swimming skills. The Tri club fielded 20 juniors and 40 senior swimmers which is quite possible the largest number to date.