Final answer:
The false statement about the principle of specificity not requiring specific training for a sport reflects a misunderstanding of the concept. Specificity in training means that the exercises should be tailored to suit the needs of the particular sport or activity, focusing on relevant muscle groups and energy systems.
Step-by-step explanation:
The principle of specificity actually refers to the idea that training should be relevant and appropriate to the sport for which the individual is training in order to produce a training effect. So, the statement that the principle of specificity refers to a general training of all your muscles for any sport is False.
By definition, training with specificity means targeting particular muscle groups, movements, and energy systems that are used in the sport or activity. For example, a sprinter would focus on developing fast-twitch muscle fibers which are crucial for quick bursts of speed, while a marathon runner would train to improve the endurance of their slow-twitch muscle fibers.
Therefore, it's false to say that all people have the same proportion of slow-twitch to fast-twitch muscle fibers. This proportion can significantly vary among individuals and can furthermore be influenced by the type of anaerobic exercise or endurance training they do.