A motorless treadmill is disclosed which exercises the upper body and lower body
of a user. Displacement of an upper-body exercise mechanism such as a pair of reciprocating
arm members rotates a drive roller, which is coupled to an endless belt through
a transmission system. The transmission system employs a double-wound belt, which
links the drive roller to the upper body exercise mechanism such that arm movements
are translated into belt rotation. The double-wound belt allows for arm motion
in both directions to directly drive the belt, through the use of one-way clutches
orientated in opposite directions on the drive shaft. Further, the double-wound
belt transmission system allows independent operation of each arm. A flywheel may
be added to store energy to smooth the belt rotation.
