Nyssa has brought an assortment of shoes to try out on the laboratory's pumps. She begins by working the pedals barefoot as a control, then tries a pair of strappy flat-heeled T-strap sandals, a flat toe-loop flip-flop sandal, a flat thong sandal, and a flat, bow-adorned flip-flop sandal, and a pair of Converse All-Stars. Which will she prefer?