How DNA Testing Helped Mack Achieve His Physical Breakthrough
https://www.youtube.com/watch?v=2M3z6rgFRaw
Nobody is born with Mack's physique, not even Mack himself.
Most body-builders stepped on stage in their 20s; in Mack's case, he was 33.
How did grief get Mack into body-building, and how did the fitness maniac defy age and time to achieve his physical break-through?
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