The fundamentals of gaining muscle is creating a stimulus to force muscle adaption such as resistance training and with this eating in a calorie surplus. However gaining muscle goes beyond the simple eat more and lift heavier.

Sleeping patterns and quality of sleep, level of stress, digestive health, current level of body fat, current diet and its quality of nutrients, food preferences, activity, training execution, recovery capacity, family life, social circles, occupation and current mindset all need to be taken into consideration to map out a path that will allow you achieve sustainable results.