>>7672139 (OP)Life drawing/Gesture exercises. You gotta learn how the body moves and acts learn to a point of independence from reference(or at least be able to act it out yourself to see what it is you are actually trying to do).
For reference as I was studying/learning I was drawing the skeleton once a day(I had the privlage of having an actual one to look at so just try to find high quality pics/3D models) cause most gestures require you to draw a basic skeletal frame anyway, and do the basic 1 minute 3 minue 5 minute gesture exercises. I had an actual teacher in my case but since Im unaware of your situation just pirate Karl Gnass's Masters Academy course on the subject.
And if your goal is
>>7672268then look up concept art of whatever shitty cartoon you are obsessed with at the moment and apply those exercises to those cartoon characters. As I did my life drawing lessons I studied concept art during the same time just cause I found it interesting. It helps