Source:- Google.com.pk
Fitness.com is a website where we find all about the fitness.Fitness may refer to:
Physical fitness, a general state of good health, usually as a result of exercise and nutrition
Fitness (biology), an individual's ability to propagate its genes
Fitness (magazine), a women's magazine, focusing on health and exercise
Fitness and figure competition, a form of physique training, related to bodybuilding
Fitness approximation, a method of function optimization evolutionary computation or artificial evolution methodologies
Fitness function, a particular type of objective function in mathematics and computer science
A fitness function is a particular type of objective function that is used to summarise, as a single figure of merit, how close a given design solution is to achieving the set aims.
In particular, in the fields of genetic programming and genetic algorithms, each design solution is represented as a string of numbers (referred to as a chromosome). After each round of testing, or simulation, the idea is to delete the 'n' worst design solutions, and to breed 'n' new ones from the best design solutions. Each design solution, therefore, needs to be awarded a figure of merit, to indicate how close it came to meeting the overall specification, and this is generated by applying the fitness function to the test, or simulation, results obtained from that solution.
The reason that genetic algorithms cannot be considered to be a lazy way of performing design work is precisely because of the effort involved in designing a workable fitness function. Even though it is no longer the human designer, but the computer, that comes up with the final design, it is the human designer who has to design the fitness function. If this is designed badly, the algorithm will either converge on an inappropriate solution, or will have difficulty converging at all.
Moreover, the fitness function must not only correlate closely with the designer's goal, it must also be computed quickly. Speed of execution is very important, as a typical genetic algorithm must be iterated many times in order to produce a usable result for a non-trivial problem.
Fitness approximation may be appropriate, especially in the following cases:
Fitness computation time of a single solution is extremely high
Precise model for fitness computation is missing
The fitness function is uncertain or noisy.
Two main classes of fitness functions exist: one where the fitness function does not change, as in optimizing a fixed function or testing with a fixed set of test cases; and one where the fitness function is mutable, as in niche differentiation or co-evolving the set of test cases.
Another way of looking at fitness functions is in terms of a fitness landscape, which shows the fitness for each possible chromosome.
Definition of the fitness function is not straightforward in many cases and often is performed iteratively if the fittest solutions produced by GA are not what is desired. In some cases, it is very hard or impossible to come up even with a guess of what fitness function definition might be. Interactive genetic algorithms address this difficulty by outsourcing evaluation to external agents (normally humans).
In function optimization, fitness approximation is a method for decreasing the number of fitness function evaluations to reach a target solution. It belongs to the general class of evolutionary computation or artificial evolution methodologies.
In many real-world optimization problems including engineering problems, the number of fitness function evaluations needed to obtain a good solution dominates the optimization cost. In order to obtain efficient optimization algorithms, it is crucial to use prior information gained during the optimization process. Conceptually, a natural approach to utilizing the known prior information is building a model of the fitness function to assist in the selection of candidate solutions for evaluation. A variety of techniques for constructing of such a model, often also referred to as surrogates, metamodels or approximation models – for computationally expensive optimization problems have been considered.
Common approaches to constructing approximate models based on learning and interpolation from known fitness values of a small population include:
low-degree
Polynomials and regression models
Artificial neural networks including
Multilayer perceptrons
Radial basis function networks
Support vector machines
Due to the limited number of training samples and high dimensionality encountered in engineering design optimization, constructing a globally valid approximate model remains difficult. As a result, evolutionary algorithms using such approximate fitness functions may converge to local optima. Therefore, it can be beneficial to selectively use the original fitness function together with the approximate model.
Fitness and Figure competition is a class of physique-exhibition events for women. While bearing a close resemblance to female bodybuilding, its emphasis is on muscle definition, not size. In other words, fitness competition is a sport which fuses female bodybuilding and gymnastics into one. The class was originally introduced when female bodybuilding's popularity began to noticeably decline, in terms of both fanbase and number of participants.[1]
Fitness and Figure are two distinct forms of competition, not just one. In a Fitness contest (the older of the two disciplines), female competitors showcase their physiques (which are noticeably less massive than bodybuilders') while performing a demanding, time-limited, aerobic/dance routine. In a Figure contest, the most important attributes are a curvaceous-yet-trim body, and facial beauty; however, the physique guidelines are similar to a Fitness pageant's, and many contestants move back and forth between the two disciplines. The Figure division emerged on the bodybuilding scene when the numbers for Fitness pageant competitions started to dwindle. Typically, fitness & figure competitions are held as part of the larger-drawing bodybuilding contests.
The first women's Fitness competition was produced by Wally Boyko in 1985 at the National Fitness trade show in Las Vegas, Nevada; it included a swimsuit round, an athletic routine, and an evening gown segment. Louis Zwick, then the producer of American Muscle Magazine (a magazine-format, bodybuilding TV show on ESPN), produced and aired a segment on the pageant. The number of contests was proliferating, and Zwick himself launched Fitness America (now Fitness Universe) in 1989 to capitalize on the trend.The International Federation of BodyBuilding & Fitness soon followed suit, holding its own, sanctioned fitness pageant -- Fitness Olympia -- in 1995.
The first women's Figure competition was the NPC (National Physique Committee -- the major sanctioning body for would-be professional bodybuilders and organized amateur bodybuilding) Figure Nationals held in 2001 at Borough of Manhattan Community College's Performing Arts Center, in New York City's Tribeca section It was a qualifier and precursor to the 2003 IFBB Figure Olympia, held in Las Vegas, Nevada.The Fitness Universe organization launched their own Figure division in 2005.
Fitness competition
A typical Fitness competition consists of a swimsuit round and a routine round. In the swimsuit round, the competitors wear two-piece swimsuits and high-heeled shoes, presenting their physiques with a series of quarter- or half-turns toward the judges and audience. Physique guidelines for fitness competitions typically suggest a small amount of muscular mass; clear separations between muscle groups (but, no visible striations); and, leanness. The swimsuit must cover at least fifty percent of the gluteus maximus muscle; no thongs or G-strings are allowed. The routine round requires a physically active stage performance; most competitors attempt aerobic, dance, and/or gymnastic routines.
Fitness contests sanctioned by the International Federation of BodyBuilding & Fitness (IFBB) are the Fitness Olympia and the Fitness International. Fitness contests sanctioned by Wally Boyko Productions are the National Fitness Sanctioning Body (NFSB) Ms. Fitness USA and the International Fitness Sanctioning Body (IFSB) Ms. Fitness World. Fitness contests sanctioned by the Fitness Universe organization are the Fitness America Pageant and the Fitness Universe Pageant.
Figure competition
Figure competition is a newer sub-category of Fitness contests. Figure shows exclude the routine round common to Fitness shows. The competitors are judged solely on muscular symmetry and definition; as in Fitness shows, muscle size is downplayed. Figure competitions appeal most to women who want to compete in a body competition, but wish to avoid Fitness shows' additional athletic and creative demands (the routine round), or bodybuilding's demands for heavy muscle mass.
A typical figure competition includes two rounds, though this varies by organization. In the symmetry round, the competitors appear on stage in high-heeled shoes and a one-piece swimsuit in a side-by-side line that faces the judges. They execute a series of quarter-turns to the right, allowing the judges to view and compare them from all sides for symmetry, presentation, and other aesthetic qualities such as skin tone, hair, make-up, and stylishness of clothing. In the next round (the group comparisons), competitors return in high heels and a two-piece bathing suit, executing a series of quarter-turns. At this stage, they are judged more critically against the others for conditioning, leanness, and how "feminine" and "athletic" (as opposed to brawny) their muscularity is. Included in either of these rounds, or perhaps just the evening show, the competitors come out individually on stage for a model walk where they are judged on presentation, gracefulness, confidence, poise, and professionalism.
Figure contests sanctioned by the International Federation of BodyBuilding & Fitness (IFBB) are the Figure Olympia and the Figure International. Figure contests sanctioned by the Fitness Universe organization is the Figure Universe Pageant.
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