On Saturday 5th January, Theresa attended the 34th annual Swimarathon organised by the Lions Club of Maidenhead.
Around 800 children and adults, between the ages of 3 and 83, swam more than 283 miles and have so far raised £22,000 for charity.
Theresa said:
"I look forward to attending this event every year. It is amazing to see so many people taking part. I was delighted to speak to a number the participants and start the noon race."