Downward facing dog, moving cat...

Picture this, if you will. Human in a variety of hands-and-knees based poses, stretching out spine etc. All very zen and holistic. Along comes Mooncat. Human face is in useful cat-accessible place. Let's stick a tail up human's nose. Human makes 'oof' noise. Mooncat proceeds to stand under human. Human attempts to lower self into plank pose. Cat in way: interesting new spinal twist ensues, not helped by having one arm raised. Mooncat decides human is playing, and rolls over. Human narrowly avoids landing on cat. Mooncat, outraged, levitates, nips human smartly on ankle. Ankle is currently sole weight-bearing part of lower end of human (other leg is in the air). Human collapes.
Mooncat, retreating, looks very very smug.
Yoga and cats are not compatible.