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With people advised to only undertake one form of outdoor daily exercise during the coronavirus pandemic, questions have been raised about outdoor swimming.
Many believe that swimming outdoors, such as in rivers, lakes and the sea, is allowed and with temperatures set to rise, people's desire to dip their toe in is likely to increase.
Swim England had initially said it had consulted Public Health England that swimming in public was not permitted.
However it has since updated guidance to state while it is not necessarily banned, it is not one of the government’s suggested forms of outside activity.
A spokesman said: "Open Water swimming is not one of the government’s suggested forms of outside activity and we urge all our members to note this.
"This will not only ensure social distancing and deter mass gatherings in open water areas, but will also protect our emergency services and other members of the public.
"Whilst you may be fully competent, going into the open water could encourage less proficient members of the public to take part.
"With pools closed across the country as well, we know this is a frustrating situation for our swimmers and those who take part in all aquatic activity. However, the restrictions are currently in place for a very important reason and we’d urge all our members to ensure they abide by the Government guidelines, stay at home and avoid public gatherings to help combat the spread of coronavirus."
Beaches are managed by district councils and could be patrolled by police.
The authorities are urging people to follow the government's guidelines.
A spokesman said: "Although beaches managed by Dover District Council remain open, we would stress that people must follow Government measures and guidelines."
Prime minister Boris Johnson announced plans to close all leisure centres, including indoor swimming facilities, on Friday, March 20.
He set out in his daily conference three days later that households should abide by a full lockdown.
The advice is to stay at home other than to access food, health services or attend work, but only if you cannot work from home.
If people go out, they should stay two metres (6ft) away from others and wash their hands upon arrival home.
There should be no social gatherings, even with friends or family.