Most infielders can catch a ground ball cleanly but have trouble throwing out runners. This is because they throw like a pitcher (long and slow) instead of an infielder (short and quick).
An avg MLB runner can get to first in 4.5 seconds requiring an infielder to have a quicker release while maintaining a high velocity. MLB players also play 162+ games a year so arm maintenance is a must. To achieve their needs they loot towards archers for a more efficient arm slot. Catch the ball, bring to center chest, pull the bow, rotate trunk, and whip. All while maintaining a quick balance shuffle of the feet.
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