Physical fitness is the quantitative representation of natural and sexual selection in evolutionary biology.

It can be defined either with regard to genotype or phenotype in a specific environment. Either way, it describes individual reproductive success and equals the average contribution to the next-generation gene pool made by individuals of a particular genotype or phenotype.

Genetic fitness is manifested by the phenotype, which is also influenced by the developmental environment.

The fitness of a particular phenotype can also be different in different selective environments.


Motivation is the experience of wanting or aversion (want something, or want to avoid or escape something). As such, motivation has an objective aspect (a goal or something you aspire to) and an internal or subjective aspect (you who want or want something to go away).

This much larger range is supported by the ability to choose specific goals and values, along with "time horizons" to achieve value that may include years, decades or longer, and the ability to retest past events.

At the very least, motivation requires a biological substrate for a physical sense of pleasure and pain; thus animals can desire to disdain or disdain specific things based on perception and experience.

In particular, in the areas of genetic programming and genetic algorithms, each design solution is usually represented as a series of numbers. 

After each round of testing or simulation, the idea is to delete n worst design solutions, and generate n new design best solutions. 

Therefore, each design solution must be given a number of merit, to indicate how close it is to meeting the general specifications, and that is generated by applying the fitness function to the test or simulation, the results obtained from this solution.


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