I'm really looking at Middle infielders but this could be applied to other positions.
Middle infielders are generally some of the fastest and most agile on the baseball field. The average middle infielder is about 6'0 185lbs. Now obvisouly baseball players need to stay quick and agile, but why is it professional running backs are about the same height, but weigh another 20-40lbs more? Without a doubt running backs are generally some of the fastest and most agile on the football field.
Is it possible to maintain flexibility, agility, and speed by bulking up into the 200-225lbs range? If it is, why do players (middle infielders) stay around 185lbs?
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