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Equinox says the CDC's relaxed mask advice for vaccinated people has encouraged customers to return.
The gym chain said Tuesday was its busiest day of the pandemic.
New-membership sales in New York were up 55% this week versus the week before, it said.
The New York-headquartered luxury gym chain Equinox says it is starting to return to pre-pandemic levels of busyness.
In an interview with CNBC's Frank Holland, Equinox's executive chairman, Harvey Spevak, said that on Tuesday the chain, which has gyms around the US, recorded its busiest day of the pandemic and that it was on track to beat that Wednesday.