INCREASE VERTICAL JUMP – With our Jump 99 training shoes you can increase your vertical jump by 5-10 inches. Focus on jumping higher, running faster and being more powerful. INCREASE FAST TWITCH MUSCLE – working out properly with our jump 99 plyometric training shoes allows you to increase the fast twitch muscle we use for powerful burst of movements like jumping or sprinting. INCREASE YOUR SPEED – Increasing the strength of your fast twitch muscles allows you to lower your 50M dash time by 2/10th of a second. INCREASE CALF MASS AND DEFINITION – Jump 99 training shoes will define you calf muscles and increase the reactive strength / agility