<P> No pain, no gain (or "No gain without pain") is an exercise motto that promises greater value rewards for the price of hard and even painful work . Under this conception competitive professionals, such as athletes and artists, are required to endure pain (physical suffering) and stress (mental suffering) to achieve professional excellence . </P> <P> It came into prominence after 1982 when actress Jane Fonda began to produce a series of aerobics workout videos . In these videos, Fonda would use "No pain, no gain" and "Feel the burn" as catchphrases for the concept of working out past the point of experiencing muscle aches . </P> <P> It expresses the belief that solid large muscle is the result of training hard . Delayed onset muscle soreness is often used as a measure of the effectiveness of a workout . </P> <P> In terms of the expression used for development, the discomfort caused may be beneficial in some instances while detrimental in others . Detrimental pain can include joint pain; beneficial pain usually refers to that resulting from tearing microscopic muscle fibers, which will be rebuilt more densely, making a bigger muscle . </P>

Where does no pain no gain come from