List of poses a living entity can have, as accessed by :getPose()

All Living Entity Poses

STANDING: All entities (including players) are STANDING when outside of any of the other poses

Player Poses

These are all the poses the player can enter

FALL_FLYING: While elytra gliding

SLEEPING: While sleeping

SWIMMING: While in the swimming pose, which includes while crawling

SPIN_ATTACK: While charging from a riptide enchanted trident

CROUCHING: While crouching

Non-Player Poses

It's impossible for players to enter these poses, but other living entities can

DYING

Goat Poses

LONG_JUMPING

Frog Poses

CROAKING

USING_TONGUE

Camel Poses

SITTING

Warden Poses

ROARING

SNIFFING

EMERGING

DIGGING