In human movement, the work done against an internal or external resistance. For example, the viscous work done by a cross-country skier is calculated as the product of distance travelled and the resisting force (the product of gravitational acceleration, the mass of the skier plus skis, and the coefficient of sliding friction for a given wax, temperature, and snow condition).
The viscous work done by a skier is calculated as the product of distance travelled and the resisting forces. With permission http://www.pinedaleonline.com.
Subjects: Sports and Exercise Medicine.