Post by imperfectgolfer on Jul 10, 2021 12:26:24 GMT -5
This is the 4th post in my ongoing series of posts where I will be analysing some of the opinions expressed by Terry Rowles and Mike Adams during their 12 webinar video sessions.
In this post I will be focusing my attention on the implications of Terry Rowles/Mike Adams' golf instructional philosophy where they focus their attention on the trail hand pushing the club during the downswing. One of the most important screening tests that TR/MA perform is the "trail elbow folding" test, which determines whether the golfer should adopt an "on-top", "side-on" or "under" trail hand grip. If a golfer tests positive for an "on-top" trail hand grip pattern, then Mike Adams rigidly asserts that it will affect his hinging action during the backswing, his trail arm's motional pattern during the P4 => P6 time period, his trail hand delivery action during the late downswing and early followthrough and also his pattern of ground reaction force development.
So, consider some of the opinions expressed by Mike Adams in one of webinar video sessions when he talks about how an "on-top" golfer should be pushing downwards between P4 => P6.
In the absence of any scientifically-conclusive golf research evidence that demonstrates that a pro golfer is actually applying a positive push-pressure force against the aft side of the club handle during the downswing, we have to rely on the computer-based technique of inverse dynamics modelling.
Here is Sasho MacKenzie's graph showing the hand couple torque and MoF torque being applied to the grip handle during the downswing of a pro golfer.
In this post I will be focusing my attention on the implications of Terry Rowles/Mike Adams' golf instructional philosophy where they focus their attention on the trail hand pushing the club during the downswing. One of the most important screening tests that TR/MA perform is the "trail elbow folding" test, which determines whether the golfer should adopt an "on-top", "side-on" or "under" trail hand grip. If a golfer tests positive for an "on-top" trail hand grip pattern, then Mike Adams rigidly asserts that it will affect his hinging action during the backswing, his trail arm's motional pattern during the P4 => P6 time period, his trail hand delivery action during the late downswing and early followthrough and also his pattern of ground reaction force development.
So, consider some of the opinions expressed by Mike Adams in one of webinar video sessions when he talks about how an "on-top" golfer should be pushing downwards between P4 => P6.
Here is a capture image from the video featuring Mike Adams.
Image 1 shows Mike Adams holding his trail palm in an "on-top" position where the trail palm faces groundwards, and he states that when an "on-top" golfer pushes downwards with his trail hand between P4 => P6 (as seen in image 2) that it will promote the development of more vertical ground reaction forces that will produce a launcher pattern of pelvic motion that will cause the left shoulder socket to move upwards. In fact, when watching his video presentation, he went from having a finite amount of anterior pelvic tilt to acquiring more posterior pelvic tilt and his head lifted because he lost some of his spinal bend inclination angle (see image 2). Imagine how much push-force a golfer must be exerting with his trail hand in a downwards direction for it to produce such a large reactive increase in vertical GRFs that will cause the body to react in that described manner. Interestingly, Mike Adams does not describe where the trail hand is applying that large amount of push-force - is it at PP#1 which is above the coupling point or is at PP#3 which is on the aft side of the club handle below the coupling point?
Mike Adams not only recommends that an "on-top" golfer should be applying a push-force with the trail hand during the early-mid downswing, he also states that the golfer should continue to apply a push-force with the trail hand against the aft side of the club handle during the late downswing and early followthrough.
Here are capture images of Mike Adams using a swim paddle attached to his trail hand, which he uses to push against the aft side of the club handle.
Mike Adams not only recommends that an "on-top" golfer should be applying a push-force with the trail hand during the early-mid downswing, he also states that the golfer should continue to apply a push-force with the trail hand against the aft side of the club handle during the late downswing and early followthrough.
Here are capture images of Mike Adams using a swim paddle attached to his trail hand, which he uses to push against the aft side of the club handle.
Image 1 is at the P6.2 position. Note that Mike Adams is pushing with his "on-top" trail hand against the aft side of the club handle below the coupling point.
Image 2 is at the P6.7 position where he is still applying a positive push-pressure with his trail hand against the aft side of the club handle below the coupling point.
Image 3 is at the P7.4 position. Mike Adams is continuously applying push-pressure with his trail hand against the aft side of the club handle i) throughout his later downswing, ii) through impact and iii) well into his early followthrough time period - and note that he is deliberately directing the club handle to move in an inside-left direction.
Note that his trail hand's continuous push action causes the club handle to bypass his lead arm, which has stalled post-impact. Mike Adams never talks about how the lead arm/hand should move through impact and he only gave one warning when he stated that a golfer should not pull his lead hand targetwards with too much speed (which is 100% contrary advice to the type of advice that I would apply to a golfer who uses a DH-hand release action).
Some of you may think that this is simply a drill and that Mike Adams does not really want a golfer to be applying so much push-force with the trail hand against the aft side of the club handle in his "real life" golf swing action. However, that's not true. Both Mike Adams and Terry Rowles stated repeatedly in their video sessions that a golfer should be applying a push-force with the trail hand against the aft side of the club handle during his full golf swing action. Here is an example of Mike Adams giving a teaching lesson in Australia, where he is definitely instructing the golfer to be applying a positive push-pressure force against the aft side of the club handle during the late downswing and early followthrough.
Video lesson of Mike Adams teaching Ian Passwell - vimeo.com/244953449/d28a95cd1f
Watch the video between the 8:24 - 8:48 minute time points.
Mike Adams wants that golfer to follow through more inside-left after impact to correct his excessive in-to-out clubhead path at impact. Note that he instructs the golfer to apply push-pressure with his trail hand against the aft side of the club handle below the coupling point. This is not simply a drill to "heal excessive lead arm pulling", but he is actually instructing that golfer to be applying that push-force with his trail hand during his "real life" golf swing's late downswing/early followthrough action in order to control the direction of the club's motion.
I have a major objection to Mike Adam's golf instructional opinion that a golfer should be applying a significant amount of push-pressure with his trail hand against the aft side of the club handle throughout the entire downswing between P4 => P7, and that objection is based on my understanding that pro golfers are not exerting a positive torque (force) against the aft side of the club handle during the P6 => P7 time period. There have been very few instrumented grip studies that attempt to measure the forces being exerted by the trail hand on the club handle during the downswing and David Tutelman believes that they are technically flawed - see www.tutelman.com/golf/swing/openloop.php?fbclid=IwAR0-lBLmbNEvQ8-uvXwDdaVQllE611SeLZtvMdZaHHQ4wQmka9iDoiey29U
Image 2 is at the P6.7 position where he is still applying a positive push-pressure with his trail hand against the aft side of the club handle below the coupling point.
Image 3 is at the P7.4 position. Mike Adams is continuously applying push-pressure with his trail hand against the aft side of the club handle i) throughout his later downswing, ii) through impact and iii) well into his early followthrough time period - and note that he is deliberately directing the club handle to move in an inside-left direction.
Note that his trail hand's continuous push action causes the club handle to bypass his lead arm, which has stalled post-impact. Mike Adams never talks about how the lead arm/hand should move through impact and he only gave one warning when he stated that a golfer should not pull his lead hand targetwards with too much speed (which is 100% contrary advice to the type of advice that I would apply to a golfer who uses a DH-hand release action).
Some of you may think that this is simply a drill and that Mike Adams does not really want a golfer to be applying so much push-force with the trail hand against the aft side of the club handle in his "real life" golf swing action. However, that's not true. Both Mike Adams and Terry Rowles stated repeatedly in their video sessions that a golfer should be applying a push-force with the trail hand against the aft side of the club handle during his full golf swing action. Here is an example of Mike Adams giving a teaching lesson in Australia, where he is definitely instructing the golfer to be applying a positive push-pressure force against the aft side of the club handle during the late downswing and early followthrough.
Video lesson of Mike Adams teaching Ian Passwell - vimeo.com/244953449/d28a95cd1f
Watch the video between the 8:24 - 8:48 minute time points.
Mike Adams wants that golfer to follow through more inside-left after impact to correct his excessive in-to-out clubhead path at impact. Note that he instructs the golfer to apply push-pressure with his trail hand against the aft side of the club handle below the coupling point. This is not simply a drill to "heal excessive lead arm pulling", but he is actually instructing that golfer to be applying that push-force with his trail hand during his "real life" golf swing's late downswing/early followthrough action in order to control the direction of the club's motion.
I have a major objection to Mike Adam's golf instructional opinion that a golfer should be applying a significant amount of push-pressure with his trail hand against the aft side of the club handle throughout the entire downswing between P4 => P7, and that objection is based on my understanding that pro golfers are not exerting a positive torque (force) against the aft side of the club handle during the P6 => P7 time period. There have been very few instrumented grip studies that attempt to measure the forces being exerted by the trail hand on the club handle during the downswing and David Tutelman believes that they are technically flawed - see www.tutelman.com/golf/swing/openloop.php?fbclid=IwAR0-lBLmbNEvQ8-uvXwDdaVQllE611SeLZtvMdZaHHQ4wQmka9iDoiey29U
In the absence of any scientifically-conclusive golf research evidence that demonstrates that a pro golfer is actually applying a positive push-pressure force against the aft side of the club handle during the downswing, we have to rely on the computer-based technique of inverse dynamics modelling.
Here is Sasho MacKenzie's graph showing the hand couple torque and MoF torque being applied to the grip handle during the downswing of a pro golfer.
The blue graph shows the hand couple torque being applied to the club handle during the downswing, the black graph shows the torque being applied to the club handle by the MoF (secondary to the lead hand pulling the club handle down the hand arc path) and the red graph shows the total torque being applied to the club handle during the downswing.
Note that the hand couple torque becomes negative after ~P6, which means that it is negative during the entire later downswing between P6 => P7. A negative hand couple torque means that the trail hand is not applying a positive push-force against the aft side of the club handle during the later downswing and it actually means that the trail hand is restraining the counterclockwise release of the club during the later downswing. Also, note that the maximum amount of positive torque being applied by the hand couple in a counterclockwise direction during the early downswing is about 35 Nm, which is very small, and only enough to combat the effect of the negative MoF, which causes the club to want to rotate in a clockwise direction.
Dr. Young-Hoo Kwon has independently performed his own inverse dynamics calculations and here is his graph.
Note that the hand couple torque becomes negative after ~P6, which means that it is negative during the entire later downswing between P6 => P7. A negative hand couple torque means that the trail hand is not applying a positive push-force against the aft side of the club handle during the later downswing and it actually means that the trail hand is restraining the counterclockwise release of the club during the later downswing. Also, note that the maximum amount of positive torque being applied by the hand couple in a counterclockwise direction during the early downswing is about 35 Nm, which is very small, and only enough to combat the effect of the negative MoF, which causes the club to want to rotate in a clockwise direction.
Dr. Young-Hoo Kwon has independently performed his own inverse dynamics calculations and here is his graph.
The blue graph is the hand couple torque, the red graph is the MoF torque, and the green graph is the total torque.
Note that Dr. Kwon also demonstrates that the hand couple torque becomes negative after P6, which means that the trail hand is not applying a positive push-force against the aft side of the club handle during the later downswing. Also, the amount of push-force being exerted in the early downswing reaches a maximum of only 40Nm, which cannot possibly be large enough to produce a reactive launcher pattern of vertical GRFs as Mike Adams has suggested.
There is another way of scientifically inferring that the hand couple torque must be negative after P6 in a pro golfer's driver golf swing action.
Here are capture images from Rory McIlroy's driver golf swing downswing.
Note that Dr. Kwon also demonstrates that the hand couple torque becomes negative after P6, which means that the trail hand is not applying a positive push-force against the aft side of the club handle during the later downswing. Also, the amount of push-force being exerted in the early downswing reaches a maximum of only 40Nm, which cannot possibly be large enough to produce a reactive launcher pattern of vertical GRFs as Mike Adams has suggested.
There is another way of scientifically inferring that the hand couple torque must be negative after P6 in a pro golfer's driver golf swing action.
Here are capture images from Rory McIlroy's driver golf swing downswing.
Note that I have drawn a yellow line along the length of his club handle. Note that his peripheral clubshaft is bent backwards at P5 (image 2) and at P5.5 (image 3) which means that a positive hand couple torque scenario exists.
Note that his peripheral clubshaft is not bent back or forwards at P6 (image 4) which means that the hand couple torque is zero.
Note that the peripheral clubshaft is bent forward at P6.5 (image 4) which means that the hand couple torque is negative. That "fact" contradicts Terry Rowles/Mike Adams' opinion that a pro golfer is applying a positive push-force against the aft side of the club handle during the later downswing. I have never see any attempt by either Mike Adams or Terry Rowles to reconcile their "belief" about applying a positive push-force against the aft side of the club handle during the later downswing and the science-based conclusion that a negative hand couple torque scenario actually exists after P6 in a pro golfer's full golf swing action (as cogently argued by David Tutelman, Sasho MacKenzie and Dr. Young-Hoo Kwon).
Note that his peripheral clubshaft is not bent back or forwards at P6 (image 4) which means that the hand couple torque is zero.
Note that the peripheral clubshaft is bent forward at P6.5 (image 4) which means that the hand couple torque is negative. That "fact" contradicts Terry Rowles/Mike Adams' opinion that a pro golfer is applying a positive push-force against the aft side of the club handle during the later downswing. I have never see any attempt by either Mike Adams or Terry Rowles to reconcile their "belief" about applying a positive push-force against the aft side of the club handle during the later downswing and the science-based conclusion that a negative hand couple torque scenario actually exists after P6 in a pro golfer's full golf swing action (as cogently argued by David Tutelman, Sasho MacKenzie and Dr. Young-Hoo Kwon).
Jeff.