Not everyone will be flexible in their body. It’s a quality that for most people will come and go, and be met with real limitations. Everyone, though, can be loose. It’s just a matter of the inherent spaciousness of Big Mind including the body as it already is. It seems that when I’m in that Space my body ceases to be a container for all the shit I hold on to. In the context of your training, use your time on the mat to let go. The rewards are endless.