The term kinetic refers to some element of motion. Chain in this example refers to the skeletal muscles that act as links in a chain to create a particular motion. “Closed” condition happens when the furthest part of your body in the movement is restricted or fixed.
Take a look at the image above of a back squat.
Squat motions, for the most part, engage your lower body. Notice how the feet are planted on the floor and cannot (should not) move during the exercise. The fixed position of your feet makes squat a closed kinetic chain exercise for the lower body.
Notice that the hips and the upper body can and should move. Since the body is one unit, even in a closed kinetic chain you still have moving parts. As long as the furthest part of your body used for the motion is fixed and restricted you have a closed kinetic chain.
What happens if, in a closed kinetic chain that primarily is designed to contain and direct energy, you place the closed end in the wrong anatomical position?
“Is there a doctor in the house?”
What happens if in a closed kinetic chain you continue placing the closed end in the wrong anatomical position?
“Are there any physical therapists in the house?”
What happens if in a closed kinetic chain, after you saw your doctor and your physical therapist, you continue placing the closed end in the wrong anatomical position?
“Are there any psychiatrists in the house?”