Bat speed can have lots to do with upper lower body synchronization.
The unhinging of the wrist in time with the extension of the lead leg is important.
You can get on a tee and take easy swings and keep the hands cocked as you turn and have your hips leading the turn and feel the connection between the the wrist release and the lead leg starightening out.
The lead leg will straighten out just prior to contact. If it not happening this way then you segments are not turning in the right order and your hands are leading your hips
Work with this and see where you are in the application and understanding of this concept.
The whole goal of the swing is to unhinge the wrist on the ball as hard as you can. The coiling of the hips, loading of the shoulders, weight shift, weight block, and release are all ways to do it harder.
Don't forget what the end goal is or you will just move everything but the bat barrel.
I've seen weighted ball programs that include throwing a 4 oz ball, a 5 oz ball (regulation), and a 6 oz ball. This is said to increase velocity. If this is true, would swinging a light bat, normal bat, and heavy bat increase bat speed?
According to the textbook Exercise and Sports Science, the "bible" of exercise physiology, 55% of the rotational velocity in both hitting and pitching comes from your legs. Build explosive leg and core strength with plyometric training, and then learn how to convert that energy into your swing. Very vague response i know, but those are the physical building blocks you need. i am sure there are many more people on this site that are much more qualified to teach the mechanical aspect.
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