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Originally Posted by bipennate
Oh, what was that? Someone asked me a question? :p
Open chain movement is a movement where the distal segment (i.e. the far bone, away from the joint) is moving on a fixed proximal segment (i.e. the closer bone leading to the joint). Take a leg extension vs. a squat (the classic example): in a leg extension, where the tibia (shin bone) moves on a fixed femur (thigh bone), there is an arthrokinematic rotation of the tibia into the epicondyles of the femur (called the "screw-home mechanism). On the other hand, in a squat, you have the femur moving on a fixed tibia (looking at the kinesthetic chain, you see that the tibia is fixed to the floor by nature of its attachment to the bones of the foot, which means that the femur must move instead), and the femur, therefore, will rotate into the condyles of the tibia...
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Okay, so if I apply this example to the bench/pushup open or closed chain question and interpret it correctly, Alcoholiday is right, bench is open and pushups are closed. Yes?