Mr Ratner estimates that about 5 per cent of his members used the gym every day and 50 per cent at least twice a week.That left half in that essential group who sign up but rarely come.

• 伦敦男士健身俱乐部的运营法则也与此相同，唯一例外是，场馆似乎不可避免地破旧不堪，而会员们也不必看到对方赤身露体的样子（至少别人带我去的那些俱乐部是这样）。