Your foot posture will stay the same until it has something to move against. We could say the floor is that something - yes it should be - but the floor actually represents it's habitual movement for every step, so we need something more and hey presto, we have the AiM wedge.

Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it
— Newtons First Law of Motion

Wedges are recognised as a significant part of an AiM session. If the feet are involved in giving the upper body some freedom or quite simply the feet need a stimulus to promote joint opening and tissue lengthening OR a surface onto which they can evert the forefoot without losing contact at the big toe... then very simply PEOPLE DO NEED THE WEDGES. 

 

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