Olivia has brought an assortment of shoes to the laboratory to see which ones maximize her comfort and control of the pedals of the laboratory pumps. She begins by working each of the pedals in a pair of Keds-style sneakers, then moves on to a pair of closed-toe flats, then a pair of medium-heeled thong sandals, then a pair of flip-flops, then a pair of flat-heeled T-strap sandals. Which will she prefer? There's only one way to find out!