This article goes more in depth regarding the adaptations you see in skeletal muscle with various workloads. Notice the principle of specificity at work.
Human skeletal muscle fiber type adaptability to various workloads
RS Staron, RS Hikida, FC Hagerman, GA Dudley and TF Murray
Muscle biopsy specimens were removed from the vastus lateralis muscles of three groups of human subjects: controls, weight lifters, and distance runners.
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