why do some people, usually fast, Arch their back?

D

Didier

New member
why do some people usually fast, Arch their back? ususllay the really fast sprinters.

i used to arch my back a little, chest out and all but it was natural because i was/am fast but in more recent years i dont arch my back anymore.

why would this be? loss in core strength or what do you think?
 
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