Credit to jujube for posting the link to the tension map video in the muscles thread where I found this method!
If you have done much posing of MakeHuman characters you know that some joints get mangled when bent, forming a crease on the side of the joint that is compressing, for example knees:
Just add a Corrective Smoothing modifier to the body:
And presto! Much improved bending action:
Here's an animated demo:
https://youtu.be/JgYy80TiVGk
You can use a vertex group if you only want to apply the modifier to a particular joint or want to use different Repeat values for different joints.
Edit:
Ah, I knew it was too good to be true.
It does a nice job on the shoulder:
This:
becomes:
but clothing doesn't keep up:
Well, I guess there is still cloth simulation to deal with that...