UK Prime Minister Boris Johnson urged people to be cautious as a stay-at-home order and some other lockdown measures are lifted in England, citing rising cases in other parts of Europe.
The government will also set up a new Office for Health Promotion to help tackle obesity, improve mental health and promote exercise. Johnson himself said he was "too fat" when he became gravely ill with COVID-19 last year.
From Monday, up to six people, or two households, in England can meet outside whilst outdoor sporting facilities such as tennis and basketball courts can be used with social contact limits in place.
Britain's vaccination programme has been one of the most successful in the world but there are concerns over supplies, high infections rates in parts of Europe and the ongoing emergence of new coronavirus variants.
"We must remain cautious, with cases rising across Europe and new variants threatening our vaccine rollout," Johnson said.
"Despite today’s easements, everyone must continue to stick to the rules, remember hands, face, space, and come forward for a vaccine when called."
A new public information campaign showing how fresh air reduces the risk of transmission will run from Monday as part of efforts to remind people not to go indoors as they socialise.
The Office for Health Promotion aims at a joined-up approach between local, national authorities and the health service, according to the government, which said around 80 per cent of health outcomes were linked to factors like diet, smoking and exercise.
"COVID-19 has demonstrated the importance of physical health in our ability to tackle such illnesses, and we must continue to help people to lead healthy lives so that we can all better prevent and fight illnesses," said Johnson.


Shooting at Australia's Bondi Beach kills 12
Police hold person of interest after Brown University shooting leaves two dead
Hamas says Israel's killing of senior commander threatens ceasefire
Ukraine's Zelenskyy ditches NATO ambition ahead of peace talks
Thailand declares curfew along coast as Cambodia border fighting spreads
India tightens pollution curbs as Delhi's air quality worsens
'Peace is not far away' says Erdogan after Putin meeting
Belarus frees Nobel winner, protest figures as US lifts more sanctions
