Kinetic energy is simply force that moves from one thing to another. Every machine or animal with hard moving parts passes kinetic energy from one part to the next.
This means that virtually every mobility or manipulation muscle exercise that humans have ever developed passes kinetic motion resistance energy from one bone to the next. This squeezes all of the motion resistance force through the joints and spinal disks in-between the bones, before it even reaches the muscles.
Thousands of years ago, when humans first began training mostly teenagers to fight their wars, they developed powerful mobility or manipulation muscle exercises that push kinetic energy up and down the skeleton about as hard as possible. If you remove all the chrome, padding, lights and music, health and fitness experts still use kinetic exercises, exactly the same way.
It is simple to see because modern mobility exercises meant to strengthen the big running muscles (at the body core) still load all of the exercise forces up through our feet, while modern manipulation exercises, still load the resistance force meant for core attached muscles, in through the hands.
As the skeleton is rapidly growing in children, correctly overworked muscles, joints and disks can all rapidly heal bigger, stronger and tougher. After the skeleton hardens into adulthood at around age 20, it is finished with rapid development.
From this point on overworked joints and disks need several weeks to fully recover. However adult muscles still retain the ability to rapidly heal stronger. For an adult to maintain a very high level of fitness they still need powerful muscle and heart exercise, about three times a week.
But as long as modern health and fitness science experts keep prescribing kinetic exercises frequently enough to maintain powerful adult fitness, they will continue prematurely wearing out the average adult's ability to do powerful traditional exercise.
Virtually no average adult can become, and then remain powerfully fit for decades, by using their joints and disks to fight their muscle contractions, which is exactly what happens with powerful kinetic exercise.
Several years ago health and fitness experts from Iowa State University published a study that found only about 3.5% of American adults get enough exercise to stay physically fit. However, if they only surveyed adults over age 35 and older, instead of 18, it is obvious that percentage would plummet, likely below 1%.
Young adults, in their early twenties, can easily overwork their muscles with kinetic exercises, because they started with newly developed joints and disks. But by their mid twenties, their joints and disks start showing wear from ever increasing pain, which starts decreasing their ability to stay fit.
The adults who did frequently overwork their joints and disks as children, will last far longer doing traditional workouts as adults, these adults have joints and disks that were developed for doing powerful exercises. This may be more important than genetics.
Frequently overworking these parts as children allows some high intensity athletes to continue using powerful kinetic exercises until their thirties, before their joints and disks start noticeably wearing out. But these people are not average adults.
The study only speculated as to why powerfully fit adults are so rare, but because health and fitness science experts are not taught about tracing the forces of exercise through the human body, speculation is all they have to offer. The only curriculum that teach how to trace invisible energy through moving parts are engineering studies, and until now engineers were not used to design powerful adult exercise methods.
Likely the most important lesson that tracing the forces of exercise trough the human body has exposed, is that targeted muscles can receive far greater resistance force, by aiming the motion resistance energy of exercise, only in the directions that fight muscle contractions first, without using the hands and feet to deliver it.
This is what a new fitness science called ARF does. ARF is an acronym for 'Aimed Resistance Force' exercise.
Because ARF aims the resistance directly against targeted muscle contractions first, muscles can be powerfully opposed for their entire motion range motion range before any remaining force can move from bone to bone.
Resistance also dissipates through motion, as unyielding stiffness passes it on. Because ARF exercises can opposes contractions through their entire motion range, most of this much greater resistance force is exhausted before it can stress or damage joints or spinal disks.
ARF means that only the adult body parts that continue the ability heal to stronger states, can be overworked by exercises. Without any powerful force moving through joints and disks, they do not need any time to recover, allowing adults to rapidly overwork only muscles, three times a week.
With traditional exercises, once a joint or disks starts failing, the user can no longer do the powerful exercise that caused that damage. Because very little force passes through joints or spinal disks with ARF exercises, their condition is of much less consequence, so even adults who have already worn down their joints and disks, can use ARF to continue overworking their muscles enough to remain powerfully fit for years longer.
ARF is not yet available at health clubs and fitness centers as it requires new workout machines, or new parts added to existing machines, which are not mass produced yet.
Body attached ARF devices are also possible for traditional floor, track and free-weight exercises, and these are also years away from consumer viability.
However, water already provides virtually all of the basic factors that must be engineered into dry ARF devices, so ARF exercise were first developed for use in swimming pools.
The contributor of these articles, leverage engineer Craig Wise, has just released an ARF book for Amazon kindle and PC downloads called 'Supercharging Adults, with ARF exercises for Water'.
You can start reading it for free by simply clicking the box on the right side of its page at Amazon.com.