Weight Painting A Human Mesh. (blender 2.6 onward)
Why Blender Stack Exchange recommends it
Blender Stack Exchange answerers point people to it when automatic weights fail or an armature deforms a mesh badly and manual weight painting is the fix.
Recommended by 4 people across 4 different months, 2015 to 2016.
What it is
A short 2012 screen-capture tutorial by AndrewWeirArt on weight painting a human mesh in Blender 2.6 and later. It shows how to assign and paint bone influence on a character so an armature deforms the mesh properly.
What people said
Recommends TLousky · 2015-09 · Blender Stack Exchange · on “Bone rig doesn't work?”
Sounds like automatic weights didn't work very well with your model. That often happens when the rest pose for weighting is inappropriate for generating automatic weights. Try fixing weights manually. [this video]
Recommends Italic_ · 2015-10 · Blender Stack Exchange · on “Messed up Armature Deformation”
There are two problems with your mesh. First, your normals are inside out, which will give you some problems if you try to skin (or anything else, really). Go into edit mode, select all of your mesh, press ctrl-n . A good way to visualize the normals of a mesh is to turn off double-sided lighting. You can do this in the mesh data tab, where you find your vertex groups. Disable the option; if the mesh looks really light, the normals are facing the right way. If it looks dark, the normals are facing inward and need to be reversed. Your screenshots show inverted normals. Now you can rig the mesh. You already have certain bones set up to deform and not deform, which is good. First you need to de
Recommends eromod · 2016-04 · Blender Stack Exchange · on “Strange stretching of mesh when using automatic weights”
The automatic weights didnt paint the entire mesh the way you want it. You can manually weight paint the mesh here is a youtube tutorial: [this video] Or just try changing the "bone envelope" and parent the bones to the mesh with automatic bone envelopes here is a tutorial: [LINK] But either way you will probably want to tweak it to make it perfect by manually weight painting a little
Recommends rcgauer · 2016-12 · Blender Stack Exchange · on “My armature isn't moving my mesh”
This missing piece to your model is the process of weight painting, which I started here: [LINK] Your model -- at least the one you uploaded for me to look at -- does not have weighting that assigns each bone to the mesh: The bluer the mesh is for a particular bone, the LESS it is attached/attracted by the bone. The redder the mesh is, the MORE it follows the bone. The subject of weight painting is one that is covered here and in other online tuts very well... but the summary answer to your question is "because your model is not weight painted...." Some resources here: [LINK] and here might be another place to start: [this video] Please let me know if I missed the point of your question, though..