Exercise apparatus with resistance selection

A method for changing resistance in an exercise apparatus having a plurality of resilient force resistors each having a first end coupled to a user engageable actuator for providing an opposing force resisting a given user exercise, said force resistors each having a second end, a plurality of locking pins each movable between first and second positions, said second position engaging and locking in place said second end of a respective said force resistor to enable said opposing force provided by said force resistor upon movement of said first end, said first position releasing said second end of said force resistor to disable said opposing force, said plurality of locking pins being selectively movable between said first and second positions such that selective ones of said locking pins may be in said first position, and selective others of said locking pins may be in said second position, the greater the number of locking pins in said second position the greater said opposing force, a user-engageable cam movable in a first direction to increase said opposing force, and in a second direction to decrease said opposing force, said cam is a rotational disc, said cam having a plurality of cam surfaces respectively engaging and camming increasing numbers of said locking pins from said first position to said second position in response to movement of said cam in said first direction, whereby to increase said opposing force, said cam surfaces respectively disengaging and releasing increasing numbers of said locking pins from said second position to said first position in response to movement of said cam in said second direction, whereby to decrease said opposing force, said method comprising moving said cam in said first direction to increase exercise resistance, and moving said cam in said second direction to decrease exercise resistance.