Building muscle needs progressive training, enough protein and enough calories, and the plan has to change as you get stronger. A muscle-gain coach manages all three.
Designs a progressive programme, sets calorie and protein targets for a lean gain, and adjusts volume and load from your logged workouts.
A surplus that's too large adds fat, and one that's too small stalls progress. Weekly check-ins let your coach fine-tune it.
Compare certifications, specialties and pricing. If you're a vegetarian, look for a coach who plans high-protein vegetarian meals.