Now, unfortunately, most athletic sports including football, cricket, basket ball, boxing, swimming, sprinting etc. all require explosive or plyometric movements. In other words, they are fast twitch muscle fiber dominant. And guess who has more percentage of fast twitch muscle fibers? [2] (Note: Type IIa muscle fibers are a type of fast twitch muscle fibers. Yes. There are different types of fast twitch muscles. However it is beyond the scope of our answer. Ah, and Tibia is the leg bone.) Research shows [3] that 6–7 year old boys can run faster and jump further than girls of the same age. In other words, males run faster and jump further even before they have had the testosteron boost in puberty. During puberty, boys develop a bigger body, broader shoulders with more muscles and less fat than women. You can see in the previous figure where a male mad more bulkier leg muscle than a female. So in short, the biological effects of elevated pubertal testosterone are primarily responsible for driving the di
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