How many days of rest between workouts leads to the fastest muscle growth?

Due to individual differences in physical constitution, there is no universal rule about how many days of rest between workouts leads to the fastest muscle gain. However, resting 2–3 days between workouts is generally considered optimal for muscle growth. The detailed explanation is as follows:

Fitness refers to the process of improving physical fitness, enhancing muscular strength, shaping body appearance, and promoting overall health through physical activities such as exercise, strength training, and aerobic workouts. Regular fitness training can increase muscle strength and endurance, improve cardiovascular and pulmonary health, help control body weight, enhance body shape and appearance, and reduce anxiety. Exercise causes microscopic damage to muscle tissues; during recovery, the body repairs these damaged tissues, making them stronger and larger. Providing sufficient rest time allows muscles to properly repair and grow. Since muscle recovery typically requires 48 to 72 hours, working out every 2–3 days is recommended.

If adequate rest is not allowed between workouts, it may lead to excessive fatigue and weakness, negatively affecting daily life and athletic performance.