Initial improvements in strength associated with resistance training are primarily due to:

Initial improvements in strength from resistance training are primarily attributed to enhancements in the nervous system. When a person begins a resistance training program, the body initially adapts by becoming more efficient at recruiting motor units and muscle fibers. This increased recruitment is largely related to changes in the nervous system, which allows for improved muscle coordination and synchronization.

As the nervous system adapts, it enhances communication between the brain and muscles, leading to more effective muscle contractions. This nervous system adaptation includes improved firing rates of motor neurons and better coordination of muscle groups, resulting in increased force production.

The improvements in the nervous system lay the groundwork for further muscle adaptations, such as hypertrophy (increase in muscle size) that develop over a longer training period. While cardiovascular adjustments, endocrine responses, and fatigue management are important in the context of overall fitness and performance, they are secondary to the immediate neural adaptations that occur during the initial stages of resistance training.