When riding a bicycle or running really fast, your back isn't completely straight.
(It's the opposite in some cartoons)

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Art Tips For All Ages
RandomNote that I am a HOBBYIST, not a professional. There are a few things that I cannot draw. However, these are just some quick tips I think will be necessary. You do not have to use this though. Exaggerating the anatomy is not a wrong. There will both...
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When riding a bicycle or running really fast, your back isn't completely straight.
(It's the opposite in some cartoons)