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Learn why humans can effectively sit up from supine position and other animals cannot. After reviewing this introduction section you can proceed to: Physics Labs section and there view Performing Sit Ups By opening course 2 preview and viewing slides 24 through 41 you will see sit up as a biomechanical study of human movement utilizing muscular skeletal leverage physics the course would teach you to understand We are going to use the example of the heavy lift crane for purposes of explanation. A crane is used to lift things.
Why a crane is strong.
How a crane does not lift. A crane does not lift like this or it would collapse. Why a crane collapses if it lifts wrong.
The human spine with the adult S-shape posture has build in cranes in the neck and lower back.
This S-shaped structure allows us to lift up our heads or sit up using strong crane-like movements.
Babies and animals have C-shaped spines that are weak for these types of movements.
This type of crane set up lifts poorly.
If the infant or animal tries to sit up, the joints get strained and want to collapse like the faulty crane structure above. This is why you don't see them or people that don't have the proper curves sit up well.
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Spinal
Biomechanics and Biomechanical
Studies of Human Movement
