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The magnitude of physical strength, often referred to as just strength, determines the ability of a person or animal to exert force on physical objects using muscles.

Strength can be divided into two categories. Short-term endurance and long-term endurance. In all muscle-based creatures, there are three muscle fiber types that fall into either categories. Slow Twitch, Fast Twitch A(Type I) and Fast Twitch B(Type II).

1 Comparison chart

	Slow Twitch	Fast Twitch A(Type I)	Fast Twitch B(Type II)
Endurance	Long term	Short-term, upper limit	Short-term, lower limit
Contraction/Reaction	Slow	Fast	Very fast
Motor neuron size	Small	Large	Very large
Glycolytic capacity	Low	High	High
Mitochondrial density	High	High	Low
Capillary density	High	Average	Low
Oxidative capacity	High	High	Low
Resistance to fatigue	High	Average	Low
Activity used for	Aerobic	Extended anaerobic	Anaerobic
Major power source(s)	Triglycerides	CP(Creatine phosphate), oxygen	CP, oxygen

2 Notes

While most people have more or less equal amounts of the fibers, some people are genetically-gifted with a disproportionate composition of them, resulting in excellent performance in a relevant sport. For example, a person with high concentrations of fast twitch B fibers would make an excellent sprinter. Simultaneously, this means that the same person would perform terribly in a long-distance run.

Hypertrophy of the muscles usually results from any sort of sufficient physical activity, though to varying degrees of size, dependant upon the physical activity itself. Hyperplasia, the introduction of additional muscle fiber, has conflicting reports on whether is it possible in humans and whether the amount of fibers added would make any useful difference.

3 Miscellaneous

Many studies show that training one rigorously harms the other - eg. large muscles are good for maximal power during short time periods, but they consume lots of oxygen which muscles need a lot during long periods of exercice.

Many athletes depend on mostly on physical strength, even though coordination and dexterityDexterity is a term referring primarily to the ability of a person to "gracefully" coordinate their movements. It specifically refers to adroitness in using the hands. In this context, dexterity is a motor skill. The term can also refer to intelligence an also play an important role.

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Topics: Physical Strength High Twitch Fast Low Muscle Muscles Activity...

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