Steve James wrote:I'm no good at all of making sense of these descriptions. The best way to test would simply to use a punch meter and see what gives the highest result.
However, I would probably say that the most power is delivered when the body (i.e., the body's momentum) and the hand/fist make contact with the opponent at the same time.
klonk wrote:what if the opponent moves back an inch and causes me to be a fraction of a second late?
Steve James wrote:I'm no good at all of making sense of these descriptions. The best way to test would simply to use a punch meter and see what gives the highest result.
Steve James wrote:However, I would probably say that the most power is delivered when the body (i.e., the body's momentum) and the hand/fist make contact with the opponent at the same time.
johnwang wrote:klonk wrote:what if the opponent moves back an inch and causes me to be a fraction of a second late?
That the time the hopping step can be effective. The interest thing is, many sports use it but many CMA systems don't have it.
https://www.youtube.com/watch?v=6T5Kma45c3o
marvin8 wrote:johnwang wrote:The Baji back hand punch power generation can be looked at this way.
1. Before foot landing - The power generated from the counter-force from the ground. The hip then start to rotate. The body start to twist.
2. During foot landing - The hip rotation has reached to the maximum.
Because hip rotation is completed at foot landing, power is leaked downwards away from the horizontal force towards the opponent, as you stated here:johnwang wrote:The reason is also simple. I can take advantage on my body weight (sinking force) and forward momentum....
If I land my foot first and strike later, I'll lose that "dropping force" with my body weight.johnwang wrote:3. After foot landing - The bullet has fired out of the gun. The current power generation is over. The next power generation will start.
Because "power generation is over" at foot landing, you have eliminated the critical component of weight transfer and shoulder and trunk rotation after the lead leg lands—that transforms vertical ground reaction force to horizontal punch force.
This essential stage of the kinetic chain can be seen at 3:45 of the "Tim Lincecum 97 mph fastball analysis" video, as well as in the following two clips:
Eliminating this critical stage in the kinetic chain is a big loss in "back hand" or straight punch power generation as the following study supports.
Excerpts from "Kinematic and kinetic analysis of throwing a straight punch: the role of trunk
rotation in delivering a powerful straight punch," https://efsupit.ro/images/stories/30dec ... %20287.pdf:RAT TONG-IAM1, PORNTHEP RACHANAVY2, CHAIPAT LAWSIRIRAT on December 08, 2017 wrote:The result showed straight punches had 3 stages, i.e., (1) starting position, (2) lead toe off, and (3) lead toe in. The results suggested that the final stage, lead toe in, was the most important in delivering powerful straight punches, and boxers used trunk rotation to transform vertical ground reaction force to horizontal punch force....
At this stage, boxers used the lead leg as a pivot point and executed straight punches such that only lead leg supported the body weight and the rear leg bore no GRF. At this stage, GRF of the rear leg decreased, while GRF of the lead leg increased, which was exactly opposite from the starting position or the first stage. From Figure 1d, the directions of GRF of the lead leg and punch force were not in the same direction. As a result, the participants utilized the lead leg as a break to stabilize their movement.... As seen in Figure 2, the kinetic chain of straight punches occurred after 70% of total punching time meaning that the whole kinetic chain was created and ended at this final stage....
Trunk Rotation in Straight Punches
Figure 1 shows phases of straight punches and GRFs for both legs.
Trunk rotation played significant role in transferring kinetic chain from the lower extremity to the upper extremity. Our results showed that the trunk was relatively unmoved at the beginning of punching as shown in Figure 2. The movement of trunk started approximately after 70% of total punching time (the right panel of Figure 2). The angular velocity tended to increase after this point. The participants, then, sped up trunk rotation after 80% of total punching time until impact.
The trunk rotation played crucial role in LTI or the final stage of punching. At LTI, the displacement angle of trunk rotation was greatest (at 80% of punching time). Angular velocity of trunk rotation increased as GRF of the lead leg increased while GRF of the rear leg decreased. The lead leg acted as a pivot point, while the rear leg pushed the trunk and the whole body of boxers forward to create punching momentum and, thus, punch force. Therefore, trunk rotation mechanically transferred vertical ground reaction forces to horizontal punching force. The peak angular velocity of trunk rotation was achieved at impact....
The final stage, which was lead toe in, was crucial in delivering powerful force.
Now with the clips and study, would you agree that, with the straight punch, "punch and foot land at the same time" generates less power than "foot first and then punch after that (properly sequenced kinetic chain punch)?" If not, what part of the clips or study do you disagree with?
Steve James wrote:The best way to test would simply to use a punch meter and see what gives the highest result.
marvin8 wrote:"What's your thought on" my reply to your same question here?
klonk wrote:
As to foot arriving first, I tend not to do that, but it isn't a terrible idea. Karate is full of punches done that way, you get grounded and drive your punches from a very solid but momentarily immobile stance. I have in the past likened these punches to firing artillery from a mount fasted firmly to the ground. Doing it that way loses a brief instant of time, but it is very stable.
In each case, you need to avoid being foot-swept as you advance, but that is a problem shared by all three possible timings of the advance.
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