Can I ask what specific technique you are using? I would like to know other gesture methods for different uses, kind of like a toolbox.
Michael Hampton's method goes from the head cervical, thoracic, stretch of the ribcage to abdomen to pelvis, lumbar, then pelvis. This makes it pretty difficult for poses where I can't see the curvature of the spine.
I used Michael Hampton's gesture techniques from his videos. I also don't feel comfortable drawing bodies that are straight or curved inwards.