Wabi sabi yoga is the yoga of imperfection.
In yoga, we can seek perfection, as in many aspects of our lives. You don't have to abandon your initial attempt, in order to improve the posture, but rather, settle into it. Relax, it's yoga!
When a Japanese tea bowl maker creates a tea bowl, the beauty is in it's imperfection. If she were to make it perfect, it would not be so beautiful, nor suitable for a tea ceremony. Beauty is in the lumps and bumps, creases, patina, in the natural.
Beauty arises from error, in the unpredicted form.
As in the Zen tradition, all that arises is already perfect, as it is.