Today (12/31/13) the engineers from the Adult Exercise Efficiency Project, responded to concerns from parents, about the study's 2013 findings, they published last week.
This report stated that healthy children need to have their joints and backs (correctly) overworked several times a week. Complaints came from parents who felt this is a rather bold stance for children, coming from engineers, not doctors, whose project is only about adult exercise methods.
This Adult Exercise Efficiency Project, appears to be the first time people have traced the paths and interactions of exercise forces, through the human body.
Their statements about children were included because the force mapping method they adapted from designing buildings, shows that adults need 'Crossing Resistance Force' exercises, to maintain powerful fitness, as children need 'Parallel Resistance Force' exercises to maximize skeletal development.
The problem with last week's report is that it implied that "all children" need to overwork their joints and backs frequently, which they admit was not worded correctly. So today they added a goal to that statement.
Today they said, "To help maximize their future adult skeletal strength, children need to correctly overwork their joints and backs, very frequently."
They added, "Rapidly growing healthy children appear to need about one hour of hard running, and another hour of stout compression exercises, each week. Likely alternating so they do one of these two workouts every other day, until they have completed both, for the week. This is about two hours of very hard skeletal exercise each week."
"However we say "appears", because engineering sciences cannot prove how often child workouts should occur, it may prove that three of these workouts, not two are needed each week, to maximize their future skeletal strength. We also only estimate the amount of time each child workout takes based on what we can determine about adults."
"We also do not know if developing joints and disks take the same amount of time to strengthen after being overworked, or if children under age 13 heal faster than teenagers."
"These and many other aspects of efficient exercise for children need to be proven by fitness and exercise science experts, not by crane, construction or leverage engineers."
"However we feel little choice about sharing our observations about children, since we can easily demonstrate that the first step for maximizing adult strength, starts by frequently overworking their joints and spinal disks, while these parts are rapidly developing."
"Because there are so many exercise variables for children, we do not know how to measure the exact efficiency of any exercise used by them. This project will never answer these questions, because these are also aspects of fitness and exercise science research, not engineering science."
"But, because adults only need powerful exercise for their muscle (hearts are muscles), their exercise efficiency is engineering, as directing forces to only go where they are beneficial requires engineers."
They claim that almost all modern workouts are only ideal for children because they all drive parallel resistance force. They demonstrate why children need powerful exercises that drive resistance energy parallel (up and down) to their legs, arms and spine, to maximize their joint and spinal disk strength.
But after their skeletons harden, at around age 20, joints and disks are essentially finished developing, and they start needing much longer time spans just to fully recover after being overworked.
So frequently overworking joints and backs is only beneficial for children, as this starts wearing out the adult ability to even use stout traditional exercises. Yet to maintain strong fitness and stamina, adult muscles and hearts still need powerful exercise, for 15-20 minutes, three times a week.
That means that one of their most interesting discoveries for 2013, that was not mentioned in their report, is that to maximize their future strength, children will need to do far more parallel exercise, than adults will need crossing force exercise for maintaining powerful fitness.
To learn the physical differences between crossing and parallel resistance forces, watch "How Aimed Resistance Force exercises work", the two minute YouTube video attached to this article.