The weight gain program is for people who cannot put on a pound. It uses lower protein with much higher carbohydrates and fat to provide energy for an extreme ectomorph to use amino acids for muscle hypertrophy. Some people wishing to engage in sports or activities requiring size and strength will benefit from this program. Many individuals with very fast metabolisms can use the glycemic index and insulin response, but in an entirely different manner. If you are struggling to put on pounds of muscle, this is the program for you.