The human body has an incredible number of muscles and muscle fibers that can be trained, built, and improved to increase athletic performance. However, it is critical for one to exercise each group of muscles so that no single group is left as a weak link. Having imbalanced muscles can lead to various different types of injuries, so it is best to simply keep a workout program well rounded and leave no stone unturned. The following groups are the main ones that are most important to build for athletics and weight lifting.

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