Actually, yes. It would involve making a major adjustment to your diet and 3M to 4M in exercise calories per day for at least 120 days. Bucket Squats, running stairs, and 6K running alternated daily with 15K on a bike. A lean high protein diet. Fish, poultry, and limited red meat. Vegetables and whole grains.
In essence, my years from 18 to 21 wearing a beanie, "snooping and pooping" and "eating snakes". Hooh Ra!! Good times.
He would be better off just lifting than doing all that cardio if the goal is to add muscle.