Exercise frequency directly influences muscle adaptation by determining how often muscles are stimulated and subjected to stress. Consistent workouts facilitate progressive overload, which is necessary for muscle growth and increased strength. However, insufficient frequency may impede these adaptations, while excessive training without adequate recovery can result in fatigue and injury. Generally, a balanced routine that includes strength training multiple times a week, combined with rest days, optimally enhances muscle adaptation, ensuring that the body effectively responds to the exercise stimuli over time.