I think attitude on occasion but more commonly for pitchers it is due to throwing too hard too many times before you get to the majors as in starting at the age of 13 , being a slave to the radar gun and playing year round etc (I recommend the book "The Arm" by Jeff Passan for an in depth look at this.epidemic).
For position players lack of flexibility strikes me as a frequent contributor to leg injuries and weight training is a contributor to upper body problems. Just sayin'

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"...If you want to look ahead to the bottom of the ninth, the Mets will be sending up Buddy Harrelson, Jerry Buchek , and Don Bosch, we'll be right back after this word from Rheingold Beer"
The late great Lindsey Nelson
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