The Law of Mutually Exclusive Configurations
Optimal Propulsion on Smooth Level Surfaces Requires The User To
Sit Lower & Further Back In The Chair.
Functional Reach Is Maximized When The User Is Sitting Higher &
Toward The Front Of The Chair.
There Is an Inverse Relationship Between the Optimal Configuration
for Smooth Level Propulsion and Most Other Functional Tasks
Transfers are easiest when The User Is Level and/or both surfaces
are matched in height.
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