BMX biking... positions to avoid?

question

Member
can anyone list certain positions to do and positions to avoid?
be it for good posture or posture that will not result in injury....
** this is for a physics project on BMX biking and it is getting really difficult to find this stuff... so like does anyone knw a site where i can get this info.... ?

and also what are some repetitive stress injuries that ocurr w/ BMX biking?


thank you! thank you so much >.<
 
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