Question: What is the number of acrobatic routines that a series should consist of?
About the article "Gymnastics", section "TeamGym".

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In the early days of women's artistic gymnastics, beam was based more in dance than in tumbling.
Routines even at the elite level were composed with combinations of leaps, dance poses, handstands, rolls and walkovers.
In the 1960s, the most difficult acrobatic skill performed by the average Olympic gymnast was a back handspring.
Balance beam difficulty began to increase dramatically in the 1970s.
Olga Korbut and Nadia Comăneci pioneered advanced tumbling combinations and aerial skills on beam; other athletes and coaches began to follow suit.
The change was also facilitated by the transition from wooden beams to safer, less slippery models with suede-covered surfaces.
By the mid-1980s, top gymnasts routinely performed flight series and multiple aerial elements on beam.
Today, balance beam routines still consist of a mixture of acrobatic skills, dance elements, leaps and poses, but with significantly greater difficulty.
It is also an individual medal competition in the Olympics. 
"For detailed information on score tabulation, please see the Code of Points article.
"A beam routine must consist of: A connection of two dance elements, one a leap, jump, or hop with legs in 180 degree split A full turn on one foot One series of two acrobatic skills Acrobatic elements in different directions (forward/sideward and backward) A dismount The gymnast may mount the beam using a springboard or from the mat; however the mount must come from the Code of Points.
The routines can last up to 90 seconds. 
Which routines are required at a competition depends on the level at which the gymnasts are competing.
At the Junior and Senior levels, all three routines are required, whereas at lower age levels, a single simpler routine is required.
Each of the routine types has a different emphasis, but all include tumbling and dance as elements.
The different routine types are as follows:  Balance (formerly known as Static) - A balance routine requires that certain poses or 'balances' and must be held static for a specific duration.
These moves require strength, poise, elegance and flexibility.
Gymnasts will combine into towers, or pyramids with the tops holding a particular position balanced on their bases.
Traditionally, balance routines were often performed to slower music, but not exclusively so.
Dynamic (formerly known as Tempo) - These routines demonstrate power, strength and grace through the performance of acrobatic moves that involve the phases of spring, flight, rotation and landing.
This often involves the base, or bases in the partnership propelling the top through the air and through a series of somersaults or twists.
The top is generally caught, or supported in the landing by their base(s).
Combined - At the more senior levels of competition, a third routine must be performed that combines both Balance and Dynamic moves, along with the usual tumbling and dance.  
The TeamGym competition is one of the latest new events within the UEG.
The first official competition was held in Finland in 1996 and it takes place every even-numbered year.
TeamGym is a team competition for clubs and consist of three sections: women, men and mixed teams.
TeamGym competitions exhibit gymnastic skills in three different disciplines; floor, tumbling and trampette.
In common for the performance is effective teamwork, good technique in the element and spectacular acrobatic elements.
The event is attractive for spectators and media as well as sponsors.
 Floor Programme: All members of the Team take part in the floor program, composed of a mixture of dance, flexibility and skill.
The routine has to be skillfully choreographed and the judges look out for changes in shape.
There needs to be at least two spins, two jumps/leaps, two acrobatic elements, two balance/power elements, two section elements and one combination of elements.
These section elements are bodywaves for women's teams, power elements for men's teams and lifts for mixed teams.
Floor routines are performed to music.
 Trampette: There are two components of this section of floor pregame.
Vault and trampette on its own.
One of the three total runs that the gymnasts make must be a vault run.
Generally the first round is chosen for each individual gymnast to perform the same move.
These are also performed to music.
 Tumbling: Again, here there are three runs (rounds) involved.
One of which has to include all six gymnasts doing a forwards series.
Another run also has to include the gymnasts completing the same move.
Each series must have at least three different acrobatic elements.
 Fédération Internationale de Gymnastique: the international sports governing body for gymnastics.
Its name is commonly abbreviated as "FIG".
Flight series: On balance beam, a series of acrobatic skills performed in combination from one end of the beam to the other.
Floor: A gymnastics apparatus used by men and women in artistic gymnastics.
The event performed upon this apparatus is known as Floor Exercise.
Floor Exercise: The event performed on the floor apparatus.
Men and women perform choreographed routines that include tumbling and acrobatic skills.
Freestyle Gymnastics: A fusion of traditional gymnastic and acrobatic tricks, with kicks and leaps inspired by martial arts, parkour and free running.
It captures the power and explosive nature of freestyle activities in sport and brings them indoors, performed on a range of purpose built equipment with associated training techniques.
Front tuck: The act of running, jumping off of 2 feet, turning in mid-air, and landing on the ground on two feet.
F. Front Full- A skill performed with one forwards flip and a twist FX: The scoring abbreviation for Floor Exercise.