Exponential Resistance Trainer
The Kellion POWERGROOVE is such a new and different
sort of apparatus that—without a certain amount of interaction
with it many capabilities—it can be difficult to grasp
why it is so special. But we can suggest something of its
nature just by noting the core attributes. These are:
 A new resistance type we call exponential,
which is a kind of “super”progressive resistance.
This element is critical to some specialized applications,
but it is a fundamental ingredient in all uses. As a significantly
more biomechanically “friendly” type of resistance
than has been previously available, it is an important advance.
 360° rotation of the main unit, providing unlimited resistance plane angles.
 True curvefollowing delivery of resistance, created by gliding independent pulleycars.
 Freeflowing, natural movement and responsiveness as a product of the gliding and pivoting action of the pulleycars together with the exponential resistance.
 Resistance that responds with dynamic variability according to the angle of the plane and the position of the user.
Simply put, the POWERGROOVE offers advances in established areas of exercise, and opens up entirely new directions of application in performance fields.
Below is a simplified depiction of resistance
types. The vertical axis represents the level of resistance,
and the horizontal axis represents action over time. The graph
on the left represents Constant Resistance, i.e., weight stack
machines. (This graph does not depict the falloff that occurs
due to weightinmotion inertia). The graph in the center
represents Simple Progressive Resistance, as produced by elastic
bands or springs. The graph on the right shows an example
of an Exponential Resistance curve.


Resistance Mechanics
This resistance carriage is comprised
of two independent sets of springs, each controlling the base
resistance level of one car/cable vector. These springs provide
a progressiveresistance substructure. Exponential resistance
is created by the dynamic mechanical interaction between the
gliding pulleys and the springs. With simple lock pins, base
resistance levels can be increased for graduated development,
and both the user position and the unit’s rotational
position can be adjusted in order to alter the resistance
level and/or rate curve in all manner of creative ways. And
because the base resistance levels can be set independently
for the two cars, the vector levels can be separately varied
to produce different effects on the body musculature.
Lock pin settings
Here is a depiction of the twocar gliding pulley system:
Here is a depiction of unit rotation:

