kBox4 manual v9.5
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What is the kBox4?
How does it work?
Setting up the kBox
The kBox4 is a self-contained, compact exercise
platform for various strength movements. It is a
multi-exercise flywheel device and uses the moment
of inertia to provide a high and variable resistance in
both the concentric and eccentric* movements of the
user.
*) Concentric muscle action is when the muscle is being shortened
during action and an eccentric muscle action is when the muscle
is being elongated during action. In some literature, concentric
and eccentric are called positive (shortening) and negative
(lengthening) phase.
The kBox has an adjustable-length drive belt wound
around a shaft located beneath the platform.
Different combinations of flywheels are mounted on
the end of the shaft.
Using hand grips or a harness attached to the pulley block, the
user pulls to accelerate the flywheel, then resists to decelerate the
flywheel as the belt winds in the other direction.
All kBox4 models have a recoil auto-retract system. The drive
belt length adjustment button allows for quick adjustments of
the belt length for the type of strength work desired. Push the
button to release and adjust the length or just push the button to
automatically retract the belt. An extension belt is used for overhead
exercises, for example, military press.
If training without both feet on the kBox4 is
anticipated, the platform must be attached to the
floor or weighted down so it cannot move. Gradually
from May 2019, the Flywheel Knob is fixed to a holder
under the kBox4 when shipped.
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