The concept of intelligent substrate utilization has emerged as a promising framework for understanding the systemic adaptations induced by chronic exercise. While traditional perspectives have focused on the isolated actions of individual myokines and exerkines, recent evidence supports a broader systems-level view in which exercise remodels an integrated endocrine communication network. This letter highlights three major advances that collectively redefine the mechanisms underlying metabolic adaptation. First, the myokine-mediated multi-organ metabolic network theory demonstrates that myokines function as coordinated regulators of inter-organ communication, governing substrate flux through complex and pleiotropic signaling pathways. Second, systems genetics analyses from the MoTrPAC consortium reveal that endurance training remodels the endocrine architecture linking multiple tissues, identifying subcutaneous white adipose tissue, extracellular matrix factors, and WNT signaling molecules as central hubs of adaptive crosstalk. These findings suggest that efficient substrate utilization is an acquired property of a dynamically restructured network rather than a fixed physiological program. Third, the discovery of metabokines and lipokines expands the classical endocrine paradigm by recognizing metabolites and lipid-derived molecules as active signaling mediators that coordinate systemic metabolic responses. Together, these advances support the notion that chronic exercise educates the body's endocrine matrix, enhancing its capacity to anticipate energetic demands and optimize substrate allocation. Understanding this adaptive communication network may represent a critical frontier in exercise and organ crosstalk research.