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</html><description>Bij het ontwerpen van fietsen, is gezocht naar het meest optimale ergonomische ontwerp. De hedendaagse fietsen zorgen ervoor dat je de juiste spieren gebruikt (de dijspieren, de meest krachtige spieren in het menselijk lichaam), in de juiste beweging (een gelijkmatig ronddraaiende actie met de voeten) in de juiste snelheid (60 tot 80 draaiingen per minuut)....lees verder</description><thumbnail_url>https://www.coop-africa.org/images/stories/voorscholieren/fietsenenenergie.jpg</thumbnail_url></oembed>
