1. doesnt use his legs enough 2. legs are not moving thru quick enough 3. needs to have his legs lead and his core to snap thru 4. doesnt finish low enough
It seems to me as if he is rushing it. He doesn't take a very long stride, he is way to up and down and he just seems too be rushing it. If he is throwing high 70's like that then he could be mid 80's with a little work in my opinion.
One thing I notice that's different than most is the action of the glove side arm (gsa). The gsa elbow stays bent throughout the motion. The glove never extends over the stride leg. Some experts would say that at front foot contact, the elbows should be aligned at 180 deg and the elbow-forearm angles should be the same on each arm. In his case, they're not. The theory is that this misalignment causes excessive stress and affects the release point, i.e. control. Most pitchers I see, extend the glove hand over the stride leg as the throwing hand extends back. The glove then settles in towards the body as the ball is released.
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