" Jogging is a "high-impact" exercise that places strain on the body, notably the joints of the knee. This is actually one of the basic reasons for doing the exercise, as the impact drives growth processes in the body . Some dropped jogging in order to take up "low-impact" exercises such as stair climbing. Jogging can be combined with other kinds of exercising. Special trails that combine them are called trim trails. Some people define jogging as an inefficient form of running which, for the given individual performing it, and all other conditions held constant, is less efficient than walking. Above a certain pace, running is a more efficient form of locomotion (requires less effort). Long Distance Running Tip Below that pace, running is less efficient than walking and makes no sense as a means of getting from point A to point B. A courier delivering a message on foot over 60 miles of road would expend more energy jogging the distance at a 13 minute mile pace rather than briskly walking it at the same pace. "

" Professional road racing's governing body is the IAAF. Competitors from around the world participate in what is dubbed the "elite" races for cash prizes. Kenyans and Ethiopians are renowned for their skill and it is rare for a race's top finishers not to include competitors from these countries. Road races are often community-wide events that highlight or raise money for an issue or project. In the USA, Susan G. Komen's Race for the Cure is held nationwide to raise breast cancer awareness. This race is also run in Germany, Italy and Puerto Rico. Running Back Tip Similarly, Race for Life holds races throughout the UK to raise money for Cancer Research. . "