Mrs Hitchcock said her husband’s cancer was incurable and “I cannot sit back and that destroy our lives without doing something”.
She has raised nearly £45,000 for research but said the most important part was raising awareness.
“There are another three or 400 people around the country doing it with us which is just unbelievable,” she added.
“We’ve got swimmers in Australia, Bali, Greece, Spain, they’ve already started sending their pictures in… it’s just incredible what’s happening.”