Swimmers brave the freezing cold to participate in a Boxing Day charity swim at Ayr Beach for Ayrshire Cancer Support on Sunday 26 December 2021 in Ayr, Scotland.

(Joanna Tavares)

Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland. New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19. (Jeff J Mitchell / Getty Images)


Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland.  New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19.

Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland. New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19. (Jeff J Mitchell / Getty Images)


Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland.  New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19.

Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland. New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19. (Jeff J Mitchell / Getty Images)


Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland.  New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19.

Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland. New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19. (Jeff J Mitchell / Getty Images)


Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland.  New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19.

Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland. New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19. (Jeff J Mitchell / Getty Images)


Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland.  New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19.

Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland. New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19. (Jeff J Mitchell / Getty Images)


Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland.  New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19.

Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland. New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19. (Jeff J Mitchell / Getty Images)


Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland.  New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19.

Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland. New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19. (Jeff J Mitchell / Getty Images)


Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland.  New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19.

Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland. New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19. (Jeff J Mitchell / Getty Images)


Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland.  New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19.

Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland. New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19. (Jeff J Mitchell / Getty Images)


Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland.  New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19.

Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland. New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19. (Jeff J Mitchell / Getty Images)


Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland.  New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19.

Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland. New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19. (Jeff J Mitchell / Getty Images)


Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland.  New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19.

Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland. New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19. (Jeff J Mitchell / Getty Images)


Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland.  New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19.

Swimmers take part in a Boxing Day charity swim on Ayr Beach for Ayrshire Cancer Support on December 26, 2021 in Ayr, Scotland. New restrictions are being introduced today in Scotland, Northern Ireland and Wales to combat the spread of the Omicron variant of COVID-19. (Jeff J Mitchell / Getty Images)