SweatBox is a men-only gym and sauna over three floors on Ramillies Street, a couple of minutes from Oxford Circus. The gym is fully equipped and clothing-optional, which is not something central London offers anywhere else.
The spa side has a dry sauna, steam rooms, a large jacuzzi and a steam maze. Private cabins are included with entry, and massage and personal training can be booked separately.
There are themed nights and foam parties on a regular rotation. Entry is by pass, bought at the door or through the venue's own app.