This is a tennis derived exercise, but it carries great benefit to all other athletes and people trying to improve their fitness. Using a doubles alley of a tennis court is the ideal size, but you can do this same exercise at home with two pieces of tape/wood 4.5ft apart. The important part is being able to balance upon landing without falling over or taking any adjustment steps. This strengthens the legs and core for both power generation and stability around joints and overall balance. If an additional challenge is needed, do this exercise while wearing a Weight Vest with adjustable weight.