The Foundational Training Scale

I was doing some research and one of the articles I read talked about this training scale:
1) Rhythm
2) Suppleness
3) Contact
4) Impulsion
5) Straightness
6) Collection

(meant to be taught in that progressive order)

I was just wondering if all of you who are much more experienced in training horses could define each one (in EVERYDAY language please ) and list some exercises that are extremely helpful in teaching and maintaining them.

Thanks so much for your help!

There are a billion threads on this - try the search function. You might have more luck searching for "training scale" "german training scale" or "dressage training scale".
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Is there? I wasn't sure what to search for exactly to get what I wanted and sometimes I'm lazy in the research department. Haha. Thanks!