Jump With Both Feet
Experienced rollerbladers may be capable of lifting off and landing with just one skate on the ground. When you are just starting out, though, it is wise to jump with both feet and pull them off the ground at the same time. Similarly, you should try to land with both feet at once, which will improve your balance and stability and make it easier to land successfully.
Keep Wheels Under You
Don't extend your feet far ahead of you or behind you. When you are in the air, try to keep your feet under your torso. When you come down into contact the ground, your upper body's weight will put a lot of pressure on the Rollerblades. Blades that are too far away from your body's center will likely slip out from under you, causing you to fall. Keeping your feet directly below your body will minimize this sideways force, making it more likely that you will stay upright.
Hold Wheels Upright
It's okay to let the blades angle out a little bit from your body, but when you are coming down from a jump, you need the blades to be close to a 90-degree angle with the ground when the wheels strike. If the wheels are at too great an angle, it will be too much stress for your ankles to manage, resulting in a fall at the least, and an ankle injury -- such as a strain, sprain or even a break -- in the worst case.
Keep Your Hands Out
When you are in the air and coming down back to the ground, keep your arms and hands out in front of you. If you land awkwardly or trip on the ground, you may pitch forward face-first. Your hands and arms should be available to take the brunt of the blow and protect your upper body from damage.