In my day back in he 60's and 70's Phil Niekro and Wilbur Wood could start a double header as Wood once did. I do not recall them have too much arm problems and they could pitch 340 innings in a year. They would tell you that there was less stress on your arm if you threw the knuckle ball. Not certain about the pitchers that throw it today, though.
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Hebrews 11:1 "Now faith is the substance of things hoped for, the evidence of things not seen"
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