in every pool, the one moon.
- Zen Forest Saying
According to the Ashtanga Yoga system, one should not practice on those days, as the body is more vulnerable to injury - either through tiredness/lack of energy or too much of it and a risk of over-exertion.
In other forms of yoga, moon days are not always respected but usually acknowledged as times of fluctuating energy, unsettled moods and hence not ideal for strong physical practices.
I myself did my usual morning practice, a gentle one. Still the moon provided me with some extra challanges to stay focused in Salamba Sirsasana.
Moon days can be seen as honouring nature, and thereby one's relationship with the world.
What about you, how do you spend your moon day? Relaxing in the chair or moving on like nothing special?