Summarize the following:
Although you should have already warmed up by this point, you can go through a mock jump right before you make the actual leap. Many athletic jumpers use a mock run-through in the seconds before as a way to build up momentum. You should do the same as you count down to your leap. Use these final moments as an opportunity to check everything you're doing with your jump set-up. In a jump down to a lower place, you won't want to jump much higher than you already are. Get just enough force to earn you the proper stance and momentum. Keep your elbows close to your body, and tuck your chin in close to your neck. Bend your knees and lunge forward however much you need to. All of this will minimize potential injury. For the sake of keeping your body straight, keep your eyes fixed forward. This will keep your body from going imbalanced in mid-jump. Some people may freak out if they see themselves dropping a far-enough distance, so if you're queasy, it's best to keep your eyes off the ground. A proper athletic jump should end in the same stance as it began. Do your best to keep your body straight. Even in freefall, it's important to keep your stance straight and stable. Letting your limbs go wild will increase the risk of injury. Keep your feet and knees together while you jump. This will maximize the chances of you landing on both feet. Although you'll want to keep your body from moving around excessively, you should allow room for flexibility as your body meets the landing. Giving your body the freedom to adjust as you meet the ground is essential for preventing injury. Don't lock your knees at any point, and give your muscles the limberness they'll need to counter the force of the land. Bending the knees will reduce shock. Just make sure your legs aren't bent more than 90 degrees. Exercising with squats will help your body adjust to this change when it's needed. If your body is "soft" (rather than tensed), you'll be able to react naturally to a landing. This is a natural way of minimizing potential damage in a fall. With this said, it's a good idea to try to make yourself as relaxed as possible before you set into your jump. Try to strike a balance between going limp and holding your proper form. In any type of jump, landing on one foot effectively doubles the amount of pressure on that foot. Do your best to keep your legs and feet together throughout the jump. This will maximize the chances of your feet hitting the ground at the same time. Landing on both feet is more important if your jump is high enough. An imbalanced fall can result in severe injury. Don't try to break your fall with your hands. Hands can alleviate some of the shock on your feet, but they can generally withstand only a fraction of the pressure that feet can. When you land, try to land on the balls of your feet, shoulder-width apart. It's not just a thing for action movies. A landing roll is arguably the best way of absorbing shock from a fall. If you're landing from a height, you should aim for a diagonal roll. Pushing yourself into a roll with one foot will avoid placing stress on your spine. As you fall, aim a shoulder to the ground in the direction you want to roll in. As you're rolling, take a foot and hit the ground with it to give you the extra force you need to complete the roll. Rolls are difficult to master and should be left to trained athletes. It should be said as a high-difficulty alternative to landing on both feet. Try rolling on both sides. It's a good habit for athletic versatility, and you may find you prefer one side over the other. For practice, regular "gymnastics rolls" (without a jump) will get you used to the experience of rolling. They're relatively easy to do provided you have a degree of fitness and flexibility. If you want to practice with diagonal rolls, a playground (with a soft ground) is a good place to start. Rolls lead well into continued movement. This is why they're so highly recommended in sports like parkour.

Summary:
Run through a mock-jump. Jump towards your target. Hold your form. Spare room for flexibility. Allow your body to go limp. Land on both feet. Perfect a landing roll.