PUREGYM Central will be closed for the rest of today.
In an email to its members, the company announced that its doors near the railway station would be shut for the rest of this Monday.
It's unclear why the gym has shut.
One member said it had been closed for two days.
In an email, PureGym said it is working hard to resolve the issue and hopes to update people very soon.
A message from the Editor
Thank you for reading this article - we appreciate your support in reading the Daily Echo.
Subscribing to the Echo means you have unrestricted access to the latest news, features and Saints coverage - all with an advertising-light website.
You will also have full access to Saintsplus, your new home for Southampton FC tactical analysis, features and much, much more.
Don't take my word for it - subscribe here to see for yourself.
Follow the latest breaking news in the Southampton area by joining our Facebook group - Southampton News - Breaking News and Incidents