During active weight bearing, not just static weight bearing, the lower extremity is somewhat fixed. That means the pelvis is free to flex and extend relative to the hard parts like the femur and its many shapes and sizes.
So, if the pelvis flexes or extends in a zone, relative to the femur, the vertebral column must adjust and realign itself to the pelvis.
Major antagonistic muscles play a huge role in aligning everything up. The resistive functions of these muscles are also worked over by gravity for stability. They serve as "antigravity" muscles!
So why do we see so many fit ideas that don't fit relative to strengths and flexibilities?
For starters, you can't track the stability from the outside!
Any less than ideal alignments of the system causing (lordosis, scoliosis, and or kyphosis) or attempt using correctable antagonistic muscles is a waste!
No wonder so many wear out fast! They spend the whole time working harder, maybe its a way to burn fat for a firmer look?
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