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The fundamental premise lies in the differing objectives of cardio and weight training. Cardio serves primarily as a means to burn fat and improve cardiovascular health. On the other hand, weight training is designed to stimulate muscle growth and strength development. However, it is essential to note that muscle growth does not happen instantaneously in the gym; rather, it occurs post-workout during recovery that involves plenty of rest, nourishment, and hydration.
Thus, the timing and type of activities undertaken after weight training can greatly affect muscular development. When cardio is performed immediately after weight training, various physiological processes can be disrupted, impacting overall gains.