<unk>  or <unk> , as used in the biomedical and weightlifting communities, is the measurement of the achievable distance between the flexed position and the extended position of a particular joint or muscle group. The act of attempting to increase this distance through therapeutic exercises<unk>  therapy -- stretching from flexion to extension for physiological gain) is also sometimes called<unk> .
A person who uses a wheelchair may improve the<unk>  in their spine, hips, knees and ankles by using a standing frame, if possible. It is necessary that the gain in joint<unk>  be accompanied by the gain in function of the muscles which control that particular<unk> .
Range of motion
Position 
Ankle reflex
Referred pain
Flexion
Dynamical system
Biceps reflex
Emotion