Definition - What does Full Moon mean?
In the context of yoga, the full moon lunar phase represents the end of the inhalation, completion, and expanding prana (energy). New and full moons create polar energies; physical and mental energy is strongest when the moon is full.
Yogapedia explains Full Moon
In traditional yogic practices, the yogi takes rest on new and full moons ("moon days") so they do not make themselves vulnerable to injuries, due to too much or too little energy.
Chandra Namaskara (Moon Salutation) is a sequence of poses that are practiced to quiet the mind and/or on days when the practitioner is feeling physically weak, stressed and/or overstimulated. It is best to practice Chandra Namaskara in the evening, in the light of the moon as it has a calming effect, preparing the practitioner for rest.
In Hatha yoga, lunar energy is considered calming, cooling and introspective.