South Yorkshire is entering the highest risk level of local lockdown as of Saturday, covering all the four local authority areas of Barnsley, Doncaster, Rotherham and Sheffield.
Local leaders agreed for a £41mln support package with the government, including £30mln to support businesses and £11mln for public health measures such as Test and Trace.
Wet-led pubs, leisure centres, betting shops, adult gaming centres and casinos are required to close, while individuals are asked not to travel in and out of those areas unless necessary.
People must not socialise with anybody outside of their household in any indoor setting, but can meet outdoors in groups of a maximum of six.
Gym classes will not be allowed and social distancing guidelines should be followed between people from different households, but gyms will remain open.
Greater Manchester to join
The decision comes a day after Westminster forced Greater Manchester to enter tier 3 from Friday despite not agreeing on a financial package with local leaders.
Mayor Andy Burnham had asked for a “bare minimum” of £65mln to protect the 2.8mln people living in the area, already lowered from the initial £90mln request.
Boris Johnson allocated £22mln of funding on Tuesday night then agreed to £60mln on Wednesday afternoon.
Sir Keir Starmer criticised the Prime Minister for failing to “find” £5mln.
Liverpool gyms ready to open
Meanwhile, fellow tier-3 Liverpool City announced gyms can reopen after pressuring the government to allow it.
“The government have agreed with the case I put forward on behalf of city region leaders and that they would now bring us in line with other tier three areas,” Liverpool Metro Mayor Steve Rotheram told the BBC.