The recommended frequency of strength training for adults is at least two to three times per week. Each session should target major muscle groups, such as the chest, back, legs, and core. Spacing workouts allows for proper recovery and muscle growth. It’s important to incorporate various modalities, including free weights, resistance machines, and bodyweight exercises, to provide a well-rounded approach to strength training. For optimal results, adults should vary their routines and progressively increase intensity over time, aligning their training with fitness goals and individual capabilities.