I go to the gym once a week.
once a week
idiom Slang
Cockney rhyming slang · East London
beak
Origin
A magistrate. In heady days many did see the "beak" once a week as a result of excessive partying on a Saturday night.
My parents call me once a week to hear about my life in the city.
The local committee meets once a week to discuss the community garden and address any concerns raised by the residents.