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the goal of those higher reps was to make quicker movements which is what u do in baseball. when u are usually lifting heavy your body movements begin to get slower. so if that was all you did and you didnt break it down into phases that may be why your throws arent as hard or accurate or whatever the case may be. when i find the program my instructer gave me, i will show you, but i got to ask him where it is again, its actually not the actual program but its general idea is branched from it.
This is a common myth. If you use heavy weight, be explosive. You'll only become slower if you lift the weight slowly. In baseball, we aren't looking for endurance, so we need to activate the anaerobic fibers in our muscles. Lifting heavy (almost to failure/under 15 reps, often much lower) IMO is key to strength and speed gain in baseball. This doesn't mean that you should lift to failure every time by any means- a mix of light and heavy days IMO will produce the best gains.