Although everybody can use weight training to dramatically increase the size of their muscles or curves, some genetically determined factors limit how much and how fast muscles/curves can be developed. These include: The number of fibers in your muscles The ratio of Type I to Type II fibers in your muscles Your body type Your hormonal balance, especially your testosterone level Let’s look at each of these limitations individually. The number of fibers in your muscles Muscle fibers were introduced into m uscle structure and motor units were introduced into h ow muscles work . You were born with a specific number of muscle fibers per motor unit, and, unfortunately, there is nothing you can do to increase the number. If you have an above-average number, you will have the potential to gain more strength and size than someone with an average number of muscle fibers. Conversely, if you have a below-average number, you will lack the potential to gain as mu...
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