Free Outdoor Gyms in Spain

The first time I saw a free outdoor gym was in Málaga, where I spent the first time after arriving to Spain. I thought it was somehow funny, and a bit strange, as I had never before seen it. 

I guess I don't need to say it doesn't exist in Norway. 

So, in Málaga I saw one close to where I lived. I never saw anyone using it, and it was in a residential area, not a park or a place with lots of people. Maybe there are more around Málaga that I didn't see?

And then I saw the same in Barcelona. Several places, and I thought maybe it's a common thing in Spain? People were using these every time I passed by.

There is one close to Forum, at the end of the beach, just off the boardwalk...

...right next to one of the skating areas.

And another one on the beach, right where those cool stone chairs are.

And also here in Las Palmas there are a couple places outdoors where you can have a little gym session if you like. Here too, many people use them.

Just along the boardwalk of Las Canteras beach in Las Palmas there are two. One just by the little library...

...and one at the Cicer-(part of the)beach, next to Mumbai Sunset, the bar with the fabulous wall with a new inspirational quote every week.

Good thing, cause gym's are really super expensive in Spain. Or at least in Barcelona. I have never seen such high prices for a gym membership (and I come from Norway where basically everything is more expensive than here.) Are outdoor gyms a common thing in other countries as well?