How Muscles Grow - from a Professional Bodybuilder

78-year-old vegan bodybuilder Jim Morris answers the question: “How do muscles grow anyway?“ If you would like to know more about Jim, here is a 14-minute short film about him: As a professional bodybuilder for 30 years, Jim won many major titles including Mr. America, Mr. USA, and Mr. International. In 1996, Jim won the Mr. Olympia masters at age 61 as a vegetarian. In 2000, Jim became a vegan for health and ethical reasons. He continues to train regularly and w