Now, this is my exercise - explained in some detail.

It could go much further than described in the short clip, it can be a preliminary warm-up exercise for each lesson, it can be altered to accommodate two notes or chords together, it can be used in variation going through all fingers in small motives (132431...) - endless possibilities. One could also go in much greater detail how to engage all pertinent hand muscles - the deep flexor muscles and superficial flexor muscles of each hand, the interplay with lumbricals and interossei, the need for ulnar and radial deviation...

More to follow!