Question: What is a successful landing in gymnastics classified as
About the article "Gymnastics", section "Landing".

Candidate passages:
In an aerial routine, or any form of tumbling, landing is the final phase, following take off and flight This is a critical skill in terms of execution in competition scores, general performance, and injury occurrence.
Without the necessary magnitude of energy dissipation during impact, the risk of sustaining injuries during somersaulting increases.
These injuries commonly occur at the lower extremities and include; cartilage lesions, ligament tears, and bone bruises/fractures.
To avoid such injuries, and to receive a high performance score, proper technique must be used by the gymnast.
"The subsequent ground contact or impact landing phase must be achieved using a safe, aesthetic and well-executed double foot landing."
A successful landing in gymnastics is classified as soft, meaning the knee and hip joints are at greater than 63 degrees of flexion.
A higher flight phase results in a higher vertical ground reaction force.
Vertical ground reaction force represents external force which the gymnasts have to overcome with their muscle force and has an impact on the gymnasts linear and angular momentum.
Another important variable that affects linear and angular momentum is time the landing takes Gymnasts can alter the shape of the area by increasing the time taken to perform the landing.
Gymnasts can achieve this by increasing hip, knee and ankle amplitude.
With the increase of height, the amplitude in ankles knees and hips rise the bars.
Teodora Ungureanu (born November 13, 1960 in Reşiţa, Romania) is a retired Romanian gymnast who competed at the 1976 Summer Olympics.
She is a three-time Olympic medalist (two silver and one bronze) and a World Championships silver medalist.
After retiring from gymnastics she has enjoyed a successful career as a gymnastics coach. 
Gymnastics flips are performed in both men's and women's gymnastics, on various apparatus including the balance beam, vault, and floor.
In all cases, gymnastics flips require the hips to pass over the head.
Four body forms are commonly employed in gymnastics flips:  Aerial - Unbent knees, with legs in a forward or side split and aligned on the rotational plane, resulting in a front aerial or side aerial, respectively.
Tuck - Legs together, with knees fully bent and drawn to the chest and hands clutching the knees or otherwise held close to the body.
By "tucking" together tightly in this manner, the body is able to reach maximum angular velocity and thus minimize the time required for the body to complete its revolution.
When initiated from a stationary, standing position, a tuck is classified as a "standing" tuck.
Layout - Body fully extended with legs together, unbent hips and knees, and arms held against the sides.
Compared to the back tuck, this flip requires both higher angular momentum and greater height above the floor in order to ensure sufficient time to complete the rotation before landing.
A layout may also include axial body rotation in addition to the fundamental rotation about the waist; such a layout is called a "twist".
Twists are further categorized by the number of axial rotations completed while airborne.
For example, a layout with 180 degree twist is a "half twist", 360 degrees for a "full twist", and multiples of 360 degrees for "double full" and "triple full" twists, and so on.
Pike - Bent hips, with knees straight and legs together.
Many gymnastics flips are descriptively named, based on the direction of rotation and the body position that is assumed during execution.
For example, a front flip performed with a tucked body form is called a "front tuck".
When initiated from a stationary, standing position, a front tuck is called a "standing front tuck". 
Completed and official opened on October 23, 2004, the Gymnastics Training Center provides of gymnastics training space to the University of Pittsburgh women's gymnastics team.
The second-largest training facility in the East Atlantic Gymnastics League, the Trees Hall gymnastics training facility has two complete vaulting set-ups (one landing into a resipit and the other into foam blocks), three sets of uneven bars (one over a resipit), a single bar over a foam block/resipit, a trench bar system, five balance beams with mount and dismount areas, low beam space, stack beams and beam dismounts into pits, a full floor exercise including tumbling pits, a rod floor/tumble trac into a resipit, an in-ground trampoline, and other amenities such as cardio equipment, lockers, and a music center.
The gymnastics team holds its home meets in Fitzgerald Field House, which sits across Aliquippa Street from Trees Hall and is also connected by an underground tunnel. 
The Fédération Internationale de Gymnastique (FIG) or International Federation of Gymnastics (IFG) is the governing body of competitive gymnastics.
Its headquarters is in Lausanne, Switzerland.
It was founded on July 23, 1881 in Liège, Belgium, making it the worlds oldest existing international sport organisation.
Originally called the European Federation of Gymnastics, it had three member countries — Belgium, France and the Netherlands — until 1921, when non-European countries were admitted, and it was renamed to its current name.
The federation draws up the rules, known as the Code of Points, which regulate how gymnast's performance is evaluated.
Six gymnastics disciplines are governed by the FIG: Artistic gymnastics (further classified as Men's Artistic Gymnastics — MAG and Women's Artistic Gymnastics — WAG), Rhythmic gymnastics (RG), Aerobic gymnastics (AER), Acrobatic gymnastics (ACRO) and Trampolining (TRA).
Additionally, the federation has been considered the authority responsible for determining whether gymnasts are old enough to participate in the Olympics.