A drag force acting in the same direction as a body's motion through a fluid. A tailwind, for example, which has a velocity greater than the velocity of a moving body contributes to the forward propulsion of the body. Propulsive drag contributes to movements of swimmers especially those doing the front crawl. Backward movements of the hands and arms through the water produce forwardly directed reaction forces which help to propel the swimmer forwards.
Subjects: Sports and Exercise Medicine.