Use half & half or heavy whipping cream to add calories to the shakes. Buy a loaf of bread, peanut butter & jelly and have him eat sandwiches throughout the day.
Rippetoe always recommended to GOMAD program for hard gainers (Gallon Of Milk A Day). Depending on his bodysize that might be a bit much but you could use the concept.
Rippetoe always recommended to GOMAD program for hard gainers (Gallon Of Milk A Day). Depending on his bodysize that might be a bit much but you could use the concept.