What does the word hyperextension mean?

Hyperextension means the extension of a joints, muscles or tendons past their normal range of movement.
In exercise routines it is a workout routine that extends the spinal region, the lower, mid and upper back especially the erector spinae. These are the large group of muscles that are the main movers of extension, lateral flexion and rotation of the spine.  

Hyperextension means the extension of a joints, muscles or tendons past their normal range of movement.
In exercise routines it is a workout routine that extends the spinal region, the lower, mid and upper back especially the erector spinae. These are the large group of muscles that are the main movers of extension, lateral flexion and rotation of the spine.