This document discusses various concepts related to developing effective training programs. It explains that while targeting different muscle groups each day can help build muscle mass, it is not optimal for performance goals. Effective training programs are periodized and include microcycles, mesocycles and macrocycles to progressively overload the body over time. Programs can follow linear, undulating or other periodization models and manipulate volume, intensity and other variables. Sets, reps and exertion levels should be tailored to the specific fitness traits or goals being targeted.