The borough's largest sports centre is offering a deal of four sessions with a private trainer for just £85.
"This is a saving of about £30 for anyone who wants to take advantage opf the deal," said a spokesperson.
"We want to make sure that everyone's hard work during the year doesn't go to waste over the Christmas period. We know that sometimes you need that extra help to keep the weight under control when the temptations are increased - which is why we have launched this offer. Now everyone can stay in shape and still enjoy the Christmas treats."
Full details are available at the reception of Westcroft sports centre in Carshalton.