Either this is crap, the writer doesn’t know the quantum mechanics or both. This sounds suspiciously like the voluminous ether.
No! When you are doing bench press, your pushing down with the left leg and pushing up with the right arm and the same happens with the right leg and left arm. That is what happens when you are trying to do the concentric contraction. When you are lowering the bar you don’t use your legs (or not that much). OL movements like the clean occurs bc you are pushing off with both feet and pulling with both arms.
The argument behind the jumping jacks is that the left leg goes out with the left arm and the right leg goes out with the right arm. Although now that I think about it, there is nothing dissproving that the when the left leg goes out that the right arm goes up and that when the right leg goes out the left arm goes up. So it is possible that he Kurz is wrong. But why on earth would you take a risk (no matter how small) on doing an exercise that may hurt your sprinting performance? Somebody pointed out that bc the jumping jacks are a warmup then it would not interfere with the sprinting motor pattern bc its high intensity. OK, that’s a good point, but why take the risk? I don’t see sprinters doing jumping jacks to warm-up so we can through the sprinters out of this debate and focus on people who do use jumping jacks to warm-up. Athletes like those that are involved in Karate or martial arts for example.
What if the jumping jacks do resemble a similar skill? Then they should be avoided. Anyway you put it, I don’t see the need to do jumping jacks, there are many calensetics that one can do to warm-up.
Now as for all this chi or energy nonsense, TNT you say you are not afraid of the FORCE, but Yoda says,“Hmmm, you will be, YOU WILL BE”.
How’s this,
Definition
The Force is described by Obi-Wan Kenobi as “an energy field created by all living things. It surrounds us, penetrates us, and binds the galaxy together.” The Force is life, and life is the Force. Some think of the Force as a sentient entity that may be capable of intelligent thought—almost as if it were a sort of God—while others simply consider it a thing that can be manipulated.
In the movies and movie novelizations, there are two aspects of the Force: the light side (never directly called such in the movies) and the dark side. These are concerned with the moral compass of the Force in its various manifestations. The light side of the Force is the facet of that energy field aligned with good, benevolence, and healing. The dark side of the Force is the element aligned with fear, hatred, aggression, and malevolence; this side of the Force seems more powerful, though it is just more tempting to those that can touch upon the power. In the Expanded Universe, the Force manifests two additional aspects: the Unifying Force and the Living Force. These are defined by prominent Jedi philosophies. The Unifying Force essentially embraces space and time in its entirety. The Living Force deals with the directly ongoing niches present in the Force.
It can only be harnessed by a minority of beings described as “Force-sensitive.” These have been defined as either having a high count of microorganisms called midi-clorians—the more midi-chlorians, the greater the person’s Force ability—or having a strong Force “aura.” It is probable that these traits are connected. Force-adepts are able to tap into the Force to perform acts of great skill and agility and control its various embodying powers (see below).
The Force appears to be connected to, or responsible for, the destinies of living beings. As Chancellor Palpatine (Darth Sidious) says in Episode III, some Sith masters were able to manipulate the Force to save their loved ones.
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Sources
Although fictional, the Force does contain many similarities to existing philosophical and religious principles. The concept may be indebted to the Odic force of Baron Carl Reichenbach. Many have related it to the concepts of Qi (also “chi” or “ki”) (China and Japan), Prana (India), Mana (Polynesia) and other similar traditions focused around the idea of a spiritual energy that exist within the universe. With Taoism, the primary focus for Star Wars originates in the idea of Yin and Yang—the two diametrically opposed Forces of the universe. Everything from good and evil (as metaphysical concepts) to hot and cold temperatures are considered as being part of this, and it is from here we see the most prominent comparison to the light and dark sides of the Force in Star Wars. But, it must also be noted that it is even more similar to Taoist philosophy with less of a dichotomy and more of a necessary balance (seen in the philosphy of the balancing of the force).
Some have also drawn parallels between The Living Force and the use of Qi in Chinese martial arts. In the more internal arts (such as Tai Chi, Hsing-Yi, Pa-Kua and Qigong), the maintenance and use of Chi is a key part of training. Such Chi is sometimes referred to as Empty Force, meaning that it is not seen, but its effect can be felt with time and training. Some of the abilities seen in the Star Wars movies are reported to have been attained by high-level Kung-fu Masters.
Others have drawn parallels between the Force and the Hindu Upanishadic concept of Brahman, the world soul which is the sum and source of the cosmos.
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The sides of the Force
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Orthodox Jedi philosophy
There is no emotion, there is peace.
There is no ignorace, there is knowledge.
There is no passion, there is serenity.
There is no chaos, there is harmony.
There is no death, there is the Force.
The Jedi and others refer to two sides of the Force, a dark side and a light side. This echoes the concept of Yin Yang in Eastern philosophy, but is not a straight translation, as the emotional dark side is denoted as a Force of evil by the Jedi. The dark side is not made up of specific “parts” or “abilities” of the Force: the dark and light sides of the Force exist inside of the life form which uses it, made from their emotions. George Lucas compared the light and dark sides to the processes of symbiosis and cancer. A follower of the light side tries to live in harmony with those around him. Mutual trust, respect, and the ability to form alliances give the Jedi their distinct advantage over the Sith. In contrast, a follower of the dark side is only out for themselves. To strike down a living creature with the Force out of anger, fear or another emotion is of the dark side. To refrain and clear one’s self of these emotions is of the light side. Use of the dark side of the Force is distinctly frowned upon within the Jedi Order, and is strictly considered the domain of the Sith. the Force plays a major part in the Jedi use of a lightsaber in that their heightened awareness keeps them from accidentally injuring themselves while using the weapon in combat, as the blade has no relative weight, making it difficult to judge its position. Similarly, the Force allows a Jedi to use his/her lightsaber to deflect incoming blaster bolts. The Force also comes into play during the construction of a lightsaber, both in assembling its intricate innards, and the initial charging of the power cell.
Jedi are keen to keep the Force in balance. They attempt to achieve this by destroying the Sith and denying the dark side, as the dark side is corruption. This involves the purging of negative emotions such as aggression, anger, and hatred, since they can easily bring on acceptance of the dark side. In contrast, positive emotions such as love, compassion, and courage nurture the light side of the Force. The Jedi Code compares such feelings and provides insight into the ethical use of the Force.
It seems most Jedi are proponents for The Unified Force, wherein they focus on the past, present, and future as a whole (however, visions of the future are of particular significance in the conservative Jedi mindset), ignoring primary use of The Living Force. Voices for the latter espouse a philosophy of “live for the moment” and heavily rely on their instincts. This viewpoint might have allowed the Jedi Order to stave off the conflict that gave rise to the Galactic Empire, as its members lost themselves in looking forward rather than analyzing the unfolding events before them.
The organizational goal of the Jedi Order is to maintain peace and justice in the galaxy.
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Sith philosophy
Peace is a lie, there is only passion.
Through passion, I gain strength.
Through strength, I gain power.
Through power, I gain victory.
Through victory, my chains are broken.
The Force shall free me.
The dark side of the Force is innately tied to the distinctly negative ethical paradigm of the Sith. It is largely based on emotions and passion rather than peace and serenity which are preached by the light side of the Force. The dark side of the Force comes from the hate, anger, fear, aggression, vengeance, and malice in all living things. In the Star Wars movies, the practitioners of the dark side are Darth Sidious and his successive apprentices Darth Maul, Darth Tyranus, and Darth Vader.
The Jedi believe that emotions such as fear, uncertainty, doubt, anger, suffering, and attachment to the “inevitable” self-destruction, lead to the dark side. The Sith philosophy, on the other hand, is to use such emotions to fuel one’s own will to power, ego, and selfishness. The inevitably destructive havoc caused by the actions of a dark side practitioner are excused as serving a greater purpose under this philosophy.
The negative emotions increase the strength and abilities of a dark side practitioner. As a result, the dark side of the Force is extremely addictive: every time one calls on its power, one becomes more and more attached to it. Darth Vader desired to use this to his advantage during his time trying to turn his son, Luke Skywalker, to the dark side. If he could convince the young Jedi hopeful to call on the dark side enough times, the boy would find it more difficult to resist in the future.
The Sith also believe that instead of living along side the Force, one must master it and use it as a tool.
Overall, dark side relationships and organizations are inherently unstable. For instance, the pupil-master relationship of the Jedi is perverted under the Sith, as both the apprentice and the master naturally plot against one other, and one will eventually kill the other. Every time a dark side Force has risen in the Star Wars galaxy, it has collapsed from within due to its own unstable nature. The Empire is no exception. When Darth Sidious/Emperor Palpatine and Darth Vader discovered that Luke Skywalker was Vader’s son, both wanted to turn Luke to the dark side. Vader wanted his son to help him kill Sidious and rule the galaxy together, but Sidious wanted Luke to take Vader’s place as his apprentice. This phenomenon is probably the closest one can come to suggesting that the dark side is in fact weaker than the light side, as it is likewise one way of arguing that evil is weaker than good in Abrahamic religions; it was no doubt seized upon by proponents of the Potentium theory of the Force (see below).
Darth Bane considered the Force to be finite, and thus best restricted (ideally) to the use of a single Sith Lord. After the Battle of Ruusan, he eliminated the practice of having vast numbers of Sith at the same time and concentrated the dark side of the Force into two individuals: a Sith Master and Apprentice. This tradition, or “rule of two,” is still in practice with the current Sith Order, which underwent a small reformation by Dark Lady Lumiya after the deaths of Vader and Sidious at Endor.
The Dark Lords Sidious, Vader, and Tyranus had each trained some followers with dark side abilties, but none of these followers were given Sith rites, thus The Rule Of Two was essentially kept in effect during the era of Darth Sidious.
Let’s get back on topic guys…
So, basically doing jumping-jack will not screw your motor control (CNS) and will not have some bad tansfer to other motor skills like sprinting! So, maybe Kurz know his knowledge, but on this issue he has exeggerated!
You have been playing way to much Knights of the Old Republic, haven’t you? 
Actually revenge of the Sith. 
However, Lucas admitted that he based the fight scenes on asian monks and that he describes the force as Chi.