Most "beaker burials" contain male skeletons buried in a crouched position with the head resting to the north and facing east, according to religious custom.

BBC: Kingsmead Quarry 'beaker burial' woman is rare find

Resting too much weight on the upper body and forcing riders into a hunched position may be more aerodynamic, but it also puts undue strain on the human body.

ENGADGET: Engineering a better bicycle with DBC City Bike Design Alt