Whitney has brought in a variety of shoes to find the best choice for pedal pumping at the Laboratory. She first tries all the pedals barefoot, since that is what she wants the experience to most closely resemble, Then she tries a flat flip-flop, a flat thong sandal, a strappy high-heel sandal, two different sneakers - Keds and "Chucks," and finally, an elegant high-heel pump. Which do you prefer?