The rhythm doesn’t have to be apparent when reading, it’s more subconscious. If you want a very clear representation of how it works, watch Kenneth Branagh’s film adaptation of Love’s Labour’s Lost. There’s a scene where he taps out the iambic pentameter, then speaks over the tapping while exaggerating the da-dum rhythm, then continues to speak the text normally. It really showcases how it works, in my opinion.