A barre is a stationary handrail that provides support for people during various types of exercise. Barres are used extensively in ballet training and warm up exercises, where such exercises are commonly referred to as barre work. In a ballet class, barre may also refer to the part of the class that involves barre work. Barres are also used for warm up exercises in other types of dance, as well as in general fitness programs.
The design of a barre—which includes both the handrail and its support mechanism—depends on whether the barre is to be portable or permanently located. A permanent barre typically consists of a handrail that is mounted to and supported by a wall, whereas a portable barre consists of a handrail mounted onto a rigid or adjustable, free-standing supporting structure. Adjustable barre systems have the advantage of conforming to a particular dancer's height, but have the disadvantage of being more "flimsy" and less stable than fixed barre systems. Barre handrails and supports are typically made of metal, wood, plastic, or a combination of these materials.
Barres can have one or two handrails. The top rail is generally positioned at 42" above the floor, but in many systems the height of the rail can be adjusted to suit the dancer. The lower rail in double rail systems is usually positioned 10" below the top rail. The diameter of the handrails varies between 1.25 and 2 inches. 
In ballet, barre work includes both slow and fast exercises, which both serve to strengthen muscles. Slow exercises are typically performed first, to stretch and warm up muscles, and to focus on proper body form, whereas fast exercises condition dancers to maintain precise ballet technique while moving. Each exercise has a specific purpose, such as to strengthen feet and legs, increase extension, improve flexibility, and develop ballon. Proper form (posture, positions of feet and arms) is strived for in all exercises.
A barre helps dancers by providing a means of stability and balance and, consequently, barre work often comprises a significant portion of the beginning dancer's class. It is an essential tool when first learning foot placement technique, and also for beginning pointe dancers, who have not yet developed the strength and technique needed for pointe work. The barre continues to be an important tool in all levels of ballet. Barre work helps dancers prepare for partnering, with the barre simulating the support of a real partner.
When used for promoting general fitness, barre exercises may incorporate a wide variety of activities to increase stamina, flexibility and strength, including ballet movements that require balance and stimulate the core such as pliés and pirouettes.
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