Avatar Muscle & Settings tab - Unity Manual

Unity’s animation system allows you to control the range of motion of different bones using Muscles.

Unity - Manual: Quality

Unity - Manual: FBX Importer - Animations Tab

Unity - Manual: Humanoid Avatars

Unity - Manual: Avatar Mapping tab

Unity - Manual: Configuring the Avatar

Creating interactive Unity character animations and avatars [Tutorial]

Setup Avatar Muscle Settings for Animation Retargeting

Unity - Manual: Preferences

Unity - Manual: Avatar Mask window

PC, Mac & Linux Standalone build settings - Unity Manual

Unity - Manual: Build Settings