How many days per week should each major muscle group be trained?

Training each major muscle group 2 to 3 days per week is considered optimal for most individuals seeking to improve strength, endurance, and overall fitness. This frequency allows for adequate stimulation of the muscles, promoting hypertrophy and strength gains while also allowing sufficient recovery time between sessions.

When muscle groups are trained this frequently, it can help to ensure a balanced development, especially when combined with a varied workout routine that includes different types of exercises targeting each muscle group. Additionally, training muscles multiple times within a week allows for increased metabolic adaptations and better overall conditioning compared to training only once a week, which tends to be less effective for muscle growth and strength development.

Moreover, training 2 to 3 times a week ensures that individuals can effectively manage their training volume and intensity, thereby minimizing the risk of overtraining those muscle groups while still providing enough workload to achieve fitness goals.