The hip hinge is one of the most common human movements, in fact the average person hinges around 3500 times per day. The majority of this happens outside of the gym, while performing daily activities such as tying your shoes or picking up your child. Unfortunately most of us don't pay much attention to the positions that our bodies are in during these movements and that's when injuries often occur most.
Hinging is the basis of almost every "Athletic or Power" movement, from deadlifts, kettlebell swings, jumps, cleans, and snatches. It is a full body compound movement. When done correctly it utilizes most muscle groups in the body, however the primary movers are "the Hamstrings", which are comprised of three different muscles (Biceps Femoris, Semimembranosus, Semitendinosus) as well as "the Glut