READ BEFORE YOU COMMENT:

Yes, I know. You need the whole body to throw the disc. Just like you need the entire body to run or ride a bicycle. But you don't need to yank the disc forward with the whole body or force the shoulders to turn, let alone pull the torso forward. That is the point of the video.

You need a solid base to swing your arm on. That's it.

Strength training is critical, and conditioning, mobility, and flexibility are even more important. You want to prime your body to be fast and efficient. Throwing your whole body forward or feeling exhausted does not help you be fast. It may feel powerful because you use a lot of power, but in reality it's slow.

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Check the original video:
   • Understanding Vertical Shoulder Colla...  

Good luck!