FiveFrameSwing
Banned
Your question comes down to understanding the difference between a pure "momentum" based hitting approach and a hitting approach involving "stretch and fire" mechanics. Very often kids find 'momentum' to be natural, but they need to be taught 'stretch & fire' mechanics. So the answer is ... for many young hitters, it is not automatic ... at least not until it is taught, at which point it's like learning how to ride a bike ... once learned, it can be pretty much automatic ... which is why it works in the batter's box.
One way to view "stretch and fire" is the creation of torque in the midsection ... which is basically what is happening when the hips lead the upper torso & hands ... there is an introduction of dynamically created elastic stretch in the midsection. You are in a sense stretching an elastic that you unleash.
Personally I like to view the back hip as 'grabbing' the rear shoulder ... and given that hitters tend to load their rear arm in a power-vee relationship (a pinched rear forearm-to-bicep triangle orientation), the initial lowering of the rear elbow is (or should be) a result of the hips leading the way ... that is, the hips grab/tug on the rear shoulder, which is connected to the rear elbow via the rear upper arm.
I suppose another way to view this is that your upper legs and lower torso are being rotated towards contact, but your upper torso is resisting [... in golf it is referred to as an X-Stretch (since when looked down on from a 'sky view', the hip and shoulder lines give a sort of 'X' orientation)]. We could add to the upper body resistance model ... but for now, consider that your hips are attempting to pull your upper torso rotationally towards the ball ... but the upper torso resists ... and when the upper body stops resisting then the upper torso rotation towards the ball accelerates ... which includes the shoulders ... which are attached to the arms ... which are attached to the hands.
One way to view "stretch and fire" is the creation of torque in the midsection ... which is basically what is happening when the hips lead the upper torso & hands ... there is an introduction of dynamically created elastic stretch in the midsection. You are in a sense stretching an elastic that you unleash.
Personally I like to view the back hip as 'grabbing' the rear shoulder ... and given that hitters tend to load their rear arm in a power-vee relationship (a pinched rear forearm-to-bicep triangle orientation), the initial lowering of the rear elbow is (or should be) a result of the hips leading the way ... that is, the hips grab/tug on the rear shoulder, which is connected to the rear elbow via the rear upper arm.
I suppose another way to view this is that your upper legs and lower torso are being rotated towards contact, but your upper torso is resisting [... in golf it is referred to as an X-Stretch (since when looked down on from a 'sky view', the hip and shoulder lines give a sort of 'X' orientation)]. We could add to the upper body resistance model ... but for now, consider that your hips are attempting to pull your upper torso rotationally towards the ball ... but the upper torso resists ... and when the upper body stops resisting then the upper torso rotation towards the ball accelerates ... which includes the shoulders ... which are attached to the arms ... which are attached to the hands.