Pretty good art video to warn beginners, even though it's quite long.
To summarize it, there's no need for beginners to spend hours drawing a box, or cylinders or whatever. The exercises are useless when you actually understand the reason why you use them to simplify forms... which is not all the time.
I have been ignoring art youtubers for years now, but back when i watched them, i feel like they had this boner for kim jung gi, seems it got out of control...
https://www.youtube.com/watch?v=UmyVUDP4Mds