The training effect, in which individuals experience improvements in physical fitness as they continue a regular exercise regimen, is a product of

The training effect is a product of both the adaptive response of the body to an exercise regime and the boost in the metabolism the body experiences as a result of regular physical activity.

The training effect was discovered by Kenneth H. Cooper in 1960.

a

explanation:

it cools slower in the earth meaning the crystals have more time to form than lava on the surface