Change of Direction, Speed Mechanics and Plyometric Ability

Agility combines a perceptual response to a stimulus with the physical change of direction. Using the 180-degree turn, Anthony shows that athletes tend to reach for the line with the outside leg, creating a wide base of support that sends force upward and may raise injury risk. Cueing the inside leg to hit the line keeps the center of mass outside a narrow base, so gravity helps and a crossover step follows naturally. Acceleration checkpoints are a horizontal drive, low leg recovery with the foot below the knee at ankle cross, and a positive shin angle. At top speed the checkpoints are knee cross at touchdown, ankle cross and a high knee with a dorsiflexed foot. Video helps coach the process rather than only timing the outcome. In a drop jump, a stiff system turns landing energy into elastic energy in the tendons, while a compliant one loses it as heat. Untrained athletes jump higher from a countermovement jump than a drop jump, and training should reverse this, turning a squash ball into a golf ball.