When we practice hatha yoga postures we engage our muscles to create specific forms within which we then expand and stretch. In other words the actions of our muscles offer boundaries against which we then expand and stretch. Without the pliable resistance of these boundaries, our stretches would be overly casual and floppy and our expansion would be airy and formless. We need these boundaries to press up against, and we need them to be firm yet pliable. Are there activities in your daily life that would benefit from a little pliable resistance? A little containment and form? A little bit of a boundary to play against?