Comedian David Walliams will be at London's Aquatics Centre today as he helps launch this year's SwimBritain campaign to get the British public swimming.
The initiative is backed by British swimming stars including Rebecca Adlington, Ellie Simmonds and Michael Jamieson.
The campaign hopes to get half a million people across the country interested in swimming and in keeping fit.
Comedian David Walliams has launched a new pop-up toy shop in Covent Garden, dedicated to raising funds for Great Ormond Street Hospital.
All the profits will go towards supporting the families of patients at the hospital - and it's expected to raise at least £15,000.