A good, sound progressive strength training program will go a long way for helping people of all body types add muscle mass. Of course, everyone has different genetic potentials, and yes, your client will definitely have to fight harder to gain lean mass based with his body type. But as the saying goes, “it is what it is.” I don’t know where he’s at in his training, but I would be emphasizing the basic, harder core strength movements such as squats, presses (bench & shoulder), rows , deadlifts etc. As far as his diet, he will need to increase his calorie intake if he’s looking to gain weight. I would suggest that the increase in calories come from protein sources, but I would need more information there. You don’t want to go overboard on the calorie increase – 200/day is a good starting point. I hope that helps Michele.
Calories…. you have to determine how many calories that you need to sustain current weight and go from there. Add more calories than you need to sustain weight, example an extra 500 to 750 calories per day.
That ectomorph stuff really hasn’t been backed up by research. Anyone can put on weight and muscle, regardless of body frame size.
The easiest way to add calories would be to eat a hearty cereal such as Granola, and add juice to your diet to increase calories. Choose starchy vegetables – which have more calories. Add nuts as a snack an a couple of high calorie smooth/protein shakes per day.
To be really detailed, a Dietitian would need to get a lot of detailed information about you and your workout routine.
Hope this helps