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This thesis describes the process of designing
exercise machines that raise the weight of the
user as the primary source of resistance. Most
strength training machines use weight stacks or
springs as the source of resistance. While such
machines are highly evolved and provide an
excellent workout, they typically have a number
of disadvantages including high cost, and large
size and weight. A user weight-based exercise
design will reduce the cost, size and weight of
the machine. The design process considers
some important issues. Parallelogram linkages
are implemented to provide non-rotary motion
without the disadvantage of linear bearings. The
user input is located with respect to the user
providing correct relative motion for the
exercise. The design also considers proper
resistance curves during the design process.
Specific examples are given for each step of the
design process. These examples include the
evolution of ideas and the creation and use of
kinematic and automatic tools.