Okay, this element I feel will take me forever. First the tuck ups.
MN PE1
This is my maximum compression. On the fourth rep, I pull my knees in to show how compressed I could get. Neither seems like it's close to mastery. I don't know how to press on that. It seems like I need to loosen up and release and stretch everything between the spine and the knees. Does that seem accurate?
MN PE1>iM
On these, from the first angle, I do a couple keeping my back as flat I can. Then I do some wherein I allow my lower back to round. Which is correct? The second angle is one with flat back and one without. Any suggestions or clarifications?