It's one I've never seen anyone do, but I do it at home sometimes if my back is feeling a bit stiff -

Basically get into a deadlift sort of position, but legs straight/straighter, and lean forward so your face is kissing your toes completely rounding your back (or as far as you can get)

Then from there do a movement that is basically the opposite of a sit up. Like a sit up for your lower back.

Feels fantastic for my back, even some holding that back rounded position hear a bunch of cracking in my back, good cracking.

I know people say not to round your back or to do that sort of a movement, but I think they're wrong, it's a movement that body can go through, at least with just bodyweight

I'm not reading all that, just draw it in MS paint or something

Jefferson curl

Pretty sure you described prison sex.

das it mane

Mostly like that, but hanging out in the lower half of the movement, and not standing up, rather doing like a sit up motion to half way and repeat (not a back extension)

From an as curved spine as possible, to straight back, repeat.

I can imagine that must feel so good with added weights for people that get a stiff back, just opening up all the back fluid or whatever/letting things in that area expand

To about the red line, and down, repeat



All about that reverse sit up motion, rather than back extension motion/deadlifting motion