Athleisure was born in Europe in the 80s (shell suits). But lululemon has like 5 shops in total in the continent (Amsterdam, Paris, Zurich, Frankfurt, Berlin).

It has one in Manchester so I imagine it has many more cities than that.

People wearing gym clothes in their normal lives in Europe? Really not as much as in the US.

And what exactly “gym clothes” is? Shorts and a sleeveles shirt? People wear that 50 years ago outside gym. Or someone branded their particular contemporary design as “gym clothes” and pushes that? In my gym, people wear different kinds of shorts and t-shirts, mostly by nike, adidas etc, and they wear similar stuff outside. I wasn’t even aware that there is such fashion movement as “gym casual” that is distinct from “sport casual”, and I thought I was fairly fashion aware (for a guy). But i guess that Europe is now behind the trend in this matter...

Seen hundreds of girls wearing the style in the streets of Madrid and London. Granted London has ONE Lululemon store AFAIK, but it has hundreds of other brands doing the same thing too, so I doubt they set the trend.

I think you're wrong. Walk through working class neighbourhoods in Europe; Adidas track suits are the uniform for the un/under-employed.