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How ‘Agent of Shadows’ Star Chase Mattson Bulked Up Nearly 30 Pounds of Pure Muscle — Here’s His Secret Plan
The Transformation That Turned Heads
When Chase Mattson landed his breakout role in the hit series Agent of Shadows, fans were captivated not only by his intense acting but also by his striking physique. Over the course of just a few months, Mattson gained nearly 30 pounds of lean muscle, a feat that left many wondering: how did he do it?
We dug deep, consulting fitness experts and Mattson himself, to uncover exactly what his secret plan was. The actor’s transformation wasn’t a product of magic or gimmicks — it was the result of science-backed nutrition, strategic training, and mental discipline.
From Lean to Muscular: The Challenge of Adding Muscle Mass
Gaining 30 pounds of pure muscle is no small task. According to the experts at Healthline, optimal muscle gain requires a combination of resistance training, sufficient calorie intake, and recovery.
Many people struggle because they either focus on quick weight gain through fat or fail to optimize their workout routines. Mattson’s approach, however, was meticulously planned to maximize muscle hypertrophy while minimizing fat gain.
Chase Mattson’s Training Regimen: A Mix of Science and Discipline
Mattson’s workout routine was designed by his personal trainer, focusing on compound lifts like squats, deadlifts, bench presses, and overhead presses — exercises proven to stimulate multiple muscle groups simultaneously.
“We prioritized progressive overload, ensuring Chase’s muscles were consistently challenged to adapt and grow,” said his trainer. “We alternated heavy weight days with lighter recovery sessions, and incorporated accessory work for muscle symmetry.”
Training six days a week, Mattson split his workouts between upper and lower body, integrating both strength training and hypertrophy-focused sets (8-12 reps). This approach aligns with findings from WebMD that emphasize the importance of volume and intensity in muscle building.
Nutrition: Eating for Growth Without Gaining Fat
As important as training is, Mattson credits a strict nutrition plan for his incredible gains. He worked closely with a sports nutritionist who created a high-protein, calorie-surplus diet tailored to his metabolism and activity level.
His daily meals included lean protein sources like chicken breast, turkey, eggs, and fish, complex carbohydrates such as sweet potatoes, brown rice, and quinoa, plus healthy fats from avocados, nuts, and olive oil. He also incorporated plenty of vegetables for micronutrients and fiber.
“Protein is the building block of muscle,” Mattson explained in an interview. “
