The tightened measures were announced yesterday by NSW Premier Gladys Berejiklian following 19 new coronavirus cases recorded for the state.

The new rules will come into effect from midnight Saturday.

Thurgoona's Plus Fitness owner Simon Hodgson said it was unclear at this stage how gyms that operate 24 hours a day would be able to manage the new requirements. He said it might force gyms like his to scale back on opening hours.

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Manager of Albury's World Gym Ash Morosin agreed saying it could impact staff hours and retention of members if business hours were to change.

"It's kind of an unfair thing to do I believe considering that there's been no cases inside a gym in NSW," Mr Morosin said.

"I get where they're coming from, but it's a bad judgement call I believe."

After COVID-19 lockdowns earlier this year saw gyms forced to shut, Mr Hodgson said there had been a great response from the public since he reopened his doors.

"I wasn't too sure which way it would go, but because there's no sport being played and a lot of people are working from home, we've had a good influx in memberships," he said.

"It's been good for people to get out of the house, clear their head and do something they'll feel good about.

"At the moment it's been really good."

Gyms will also have to register their COVID-19 safety plans.