"Bungalow Legs" means that you will lose the ability to go upstairs! I can see what they mean... brilliant!
In a similar way, we should try not to neglect our Spanish skills, whatever stage they are at! Because there's your warning ... stop doing things for a while and you might well get the Spanish-learners equivalent of "Bungalow Legs" and find yourself slipping backwards horribly down las escaleras! Ouch.
Escalera, by the way, is linked to our word "school" ... it's all to do with the idea of progressing onwards and upwards ... you've got l'escalier in French as well, all from the Latin scalae = steps.
I've been away for a while whizzing around Wales inflicting my Welsh on unsuspecting natives, raiding charity shops for cheap Welsh novels etc, finding on the way some French ones too, but no Spanish ones unfortunately. . but enough of that, it's time for music, and we are going to thrill to the sounds of Satin Dolls ... it's a song I've put on before, No Estás. but this is an uncharacteristically quiet version ... I like it ...
http://learnspanishin88years.weebly.com/blog/no-estas
It's not you that's on the rooftop by the way, it's them... lucky they don't have Bungalow Legs or they'd never have got up there.