This is more of a ref of basic shapes that /I/ break legs down to when I draw. Breaking down your figure always good practice! I'll prob make more of sitting and other, but for now its good to get an understanding of simple poses. (like the top two, froward and backward facing) once you understand that, you can apply them to what your person is doing.
happy drawing guys
(and I'm so sorry this seems like a crappy way to show legs, but I don't really know how to explain my drawing process on them)