Most people, when they ride a bike, tuck their pelvis so the rear portion of their sitz bones rests on the seat. Then they lean over to reach the handlebars causing a lot of spine curvature. With the additional tension created from pushing the pedals and holding the handlebars, and the bouncing and jostling from the road, riding a bike this way can be a painful and harmful activity.
Many modern bike riders look like Mr. Bean when they ride a bike, sitting with an unnaturally curved spine.
Each of these modern-day bikers has a rounded spine and craned neck. Image courtesy John Matrix at bikelist.org.
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