PRONATION  really understood?

Imagine,

• you walk barefoot on, for example, sand
• you leave visible footprints of the heelstrike and caput metatarsalia behind
• you expect a (pronation) impression at the medial length arch 
• you see the opposite, the lateral impression is deeper
• the medial arch is most of the time not even visible at pronation 
• pronation is a natural and therefore normal phenomenon and no illnes
• that the anti-pronation does not make sense and may even be a contra-indication