Thanks for these sequences. We all do better when we can actually see these principles in action, and your skills in this area are a wonderful contribution to the educational mission of our site.
A question regarding your sequence of Stuart Appleby:
In Photos #1 and #3, my guess is that the yellow line represents the spine and its inclined angle to the ground ("axis tilt"). But what does the line in Photo #2 represent . . . the original angle per Photo #1? Thanks.
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