Ȳþrīdung (on Nīƿenglisce hātte surfing, on Hēahþēodisce hātte Wellenreiten, þe mǣneþ æfter ƿorddǣlum "ȳþrīdung") is ƿæterandƿlitplega on þǣm þe mann (se ȳþrīdend) rītt bord (ƿǣgbord) on þǣm hrycgum ƿǣga, stēorende þone bord þurh finna þā sind geƿunelīce on þǣm bæce þæs botmes þæs bordes. Suma gehapa stōƿa tō rīdenne ȳða sind on Sūþlande, Californian, and on manigum īegum, ānlīce īga on þǣm Sericus Gārsecge.