Planes of Motion, Athlepedia, The Athletics Wiki
The human body may be broken down into sections in terms of three anatomical planes (flat surfaces). These three planes are imaginary lines passing through the body (in an anatomical position), which represent the dynamic planes of motion that the human body is capable of moving through. This is a vertical plane running from front to back that divides the body or any of its parts into sinister (left) and dexter (right) sides. The two basic movements in the sagittal plane are flexion and extensio
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Planes of Motion, Athlepedia, The Athletics Wiki