Definition - What does Inversion mean?
In yoga, an inversion refers to poses in which the yogi's heart is at a higher level than the head. Not all inversion poses require that one is completely upside down. There are milder inversions that may be practiced by beginners before trying advanced asanas. Mastering inversion poses promotes physical and mental strength.
Yogapedia explains Inversion
Advanced inversion postures can be challenging, while milder inversion poses help the yogi rid themselves of the fear associated with going upside down.
Simple inversions include standing forward bend, child's pose, downward-facing dog pose, dolphin pose, legs-up-the-wall pose and shoulder stand. Advanced inversions include handstand and its variations, headstand and its variations, scorpion pose and one-legged inverted staff pose.
Practicing inversion poses reverses blood flow and promotes circulation, improves balance, strengthens and energizes the body, strengthens the nervous system, flushes out toxins, promotes blood flow to the brain and improves brain function and calms the mind.