The ball handler who fakes and then drives past a defender for an easy score. A pass rusher who leaves a would-be blocker in his wake on the way to sacking the quarterback. A setter who manages to maneuver both body and ball in the blink of an eye to make the perfect pass for the kill and match-winning point. These are all reasons agility and quickness are such prized physical attributes in modern sport. Efforts to become markedly quicker...