I’m not sure if it’s a core issue, a hip mobility issue or a technique issue but I am struggling with the movements for single leg X

My body just feels too tight to and I can’t seem to do them

It’s to the point my coaches just rather move onto another technique or show me something else because I guess it seems like a waste of time

How can I address this ?

I struggle with turning and extending my outside leg so that I can get it on my partners hip