Testo Muscle Fuel Work opposing muscles at the same time by performing exercises that work the chest and back or quads and hamstrings. Doing this allows a muscle to rest during the time the other one is working. You can increase the intensity of your workout to make up for spending less time in the gym.Testo Muscle Fuel Many people begin increasing their protein intake immediately upon beginning a program to build muscle which is a mistake. Starting too soon will increase your caloric intake as well, leading to fat deposits. Your body will be able to increase muscle growth best when you gradually increase your protein intake by several hundred calories several days apart.