• 5 years ago
James McAvoy's dramatic evolution into The Beast is one of Hollywood's most shocking physique transformations. To prepare for his role in Split and Glass, McAvoy packed on about 16 pounds of muscle mass in nearly four months.

Of course, that required spending lots of time in the gym with trainer Magnus Lygdback. But a good training program only goes so far without the proper diet, and McAvoy followed a well-balanced approach, which Lygdback shared with Men's Health. The star ate every three hours and generally hit the gym two hours after a meal or snack. Another meal was consumed immediately post-training, Lygdback says.

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