Hahaha, you have done your research! Yeah, you have to get innovative. Back when I was young living full time in Stockholm and going to school during the weeks days I had to be creative and this was before all of these movement simulation activities backed by scientific studies and so on. 

During the summers I towed behind my dad’s boat to understand how turns where done, where the speed came from and balance on the board and throughout manoeuvres. Whilst on land, I got my hands on the first generation of a carver skateboard that came to Sweden at a shop called Rockaway beach. That board allowed me to do the same turns on the asphalt. I found this concrete wave-shaped bank near my house where I practised turns and movements for hours that I studied from the surf movies I had. During the winter months, I snuck into our community pool where I ran from the edge on to my board with just enough speed to simulate a turn. There sure were some boards dinged in that pool over the years, hehe 😀