Eat Meat!
From a body-building perspective, meat provides a generous supply of essential amino acids, creatine and traces of zinc, which is required for insulin, growth hormone, and testosterone metabolism. Creatine helps muscle gains, which makes meats like beef with high content of it stand out vs other sources. Then again, those who abstain could just supplement it directly, since it isn't meat derived... but basically meat = muscle , muscle = strength/endurance.
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