Glad it was helpful! Also, these are definitely less stiff than before!
I totally get that. Poses feel sort of stiff when drawing them out at first, especially when the pose itself doesn't look very dynamic! But even with a regular standing pose, there is this concept called contrapposto. Where the axis of the shoulder line and the hip line are opposed instead of being parallel to one another. This is because the body leans towards the side where the center of gravity shifts. Exaggerating these angles helps create more dynamic standing poses. It's very helpful to recognize the rhythm and motion created by how the model is leaning to balance their weight.
Example of Contrapposto below! Exaggerating helps a lot!

Perhaps when you get comfortable, you can start focusing on identifying the ribcage and the pelvis. You can also try breaking down the shapes of the body through boxes and cylinders. I recommend drawing them over your reference poses. You can take your time doing this exercise until you feel like you've nailed it. That way when you do shorter 1 min or 2 min poses, instead of trying to replicate the outlines, you can recognize and draw the 3D forms that make up the pose!
here's an example! sorry that it's pretty rushed!
