Weightlifting developed as an activity almost exclusively performed by men. And they used it primarily for developing their physiques. This led to competitive bodybuilding (and steroid use, but that's another story) and various types of physique competitions (including women's).
Because of this background, resistance training became closely associated with muscular development so it's no surprise that training plans were built around muscle groups. There are different splits that people use but some common ones include back and bis (biceps), chest and tris (triceps), shoulders, and the infamous "leg day." There are many such "training splits" in use and much debate about which is best.
But there's another approach besides training muscle groups and it's the one used by StrongFast Fitness: training movement patterns.
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