https://youtu.be/6ypDk-R__HU how do you notate your 2d animation so that it animates realistically? like how in walk cycle left and right body works in balance but left leg and right hand and vice versa thus not limps orunbalanced, and then how things are not floaty or weightless, anyway basically making things move rralistically and not in unison
what are exactly the properties of realism please list them in bullet lists maybe and how can i apply these all to any sort of motions especialy walk cycles and run, trots, things that loops and give some realistic, correct result?

maybe evem explain scientifically or mathemathically why and how walking running or troting works like that