Blender - Unwanted Stretching, Bending and Twisting in Rigged Characters

Problem Overview
Bendy bone issues Basics
Quick Tip: remove zero weights
Example 1: Rigify Spine
Recommended addon: Voxel Heat Diffuse Skinning
Setting Rigid Weights
Solution 1: Remove BBones
Solution 2: add more bones
Solution 3: Pin Props to Mesh
Pin bones to Mesh
Example 2: Robot Arm/Leg twisting
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