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Marketed by Arthur Jones, the founder of Nautilus,
the cam is a mechanical device on selectorized
(weight stacked or pin loaded) strength training
equipment that varies the distribution of weight
through an exercise motion.
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 The
cam is the “gear” that provides "variable
resistance." When used on a
resistance machine, the resistance varies throughout the
range of motion in an attempt to match an individual’s
strength curve. Theoretically, by utilizing
a cam, the force of the weight is varied to maximize the
force throughout the full range. This theory
fails however, because strength curves can vary
greatly from individual to individual and therefore, a
complete workout can not be achieved by most individuals
with a fixed cam. Beyond this, it is also
critical that variety is introduced to workouts for
continued progress, and a fixed cam offers little if
any, variety.
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