In this rig tutorial , you all found how to rig a legs .This tutorial is done by Rigging By Kasper Larsson, Manoanim.This tutorial is also show how to rig in a fast way.So watch this rig tutorial and also share to all animation groups and cg artist.Actually this video is in two parts so please watch both parts.
Quadruped Rigging. Legs Part 1
Quadruped Rigging. Legs Part 2