Before you can talk to your pitchers about the so-called ideal arm path, Pitching Mechanics or let alone talk about spin rate and pitch shaping! 

Or talk to your hitter about the so-called ideal bat path, hitting mechanics or let alone talk about exit velocity!

It’s essential to know if they have a Right or Left Motor Shoulder!

Both the ambidextrous pitcher and switch hitter in the picture shows perfectly the difference in arm action as an LHP/RHP & the difference in the swing as an LHH/RHH. This is a result of his motor preferences, specifically his right motor shoulder.

Because your motor shoulder determines the range of motion of the athlete!

An LHP & LHH with a left motor shoulder will be short in the back and long in front. 

If he would have a right motor shoulder he will be long in the back and short in front.

Please take a closer look at both the ambidextrous pitcher and switch hitter, where you will see a completely different arm and bat path as Righty and Lefty!

The ambidextrous pitcher:

As an RHP – He’s Short in the back and Long in front

As an LHP – He’s Long in the back and Short in front

Edman (hitter) has a right motor shoulder, which results in:

As an RHH – Short in the back and long in front.

As an LHH – Long in the back and short in front.

As said earlier, this difference is the result of individual preferences and needs, that characterize athletes and have been woven into their personality and motor skills from an early age, such that coaches and trainers have no choice but to join them.