" Race courses are usually held on the streets of major cities and towns but they could be on any sealed road. Most road races are either 5 km (3 . 1 miles), 10 km (6. 2 miles), half-marathon (21. 097 km, 13. 1 miles), or marathon (42. 195 km, 26. Adidas Running Gear2 miles), but non-standard distances are also acceptable. The "Round the Bays" run in Auckland, New Zealand is 8. "

" 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). Wagon Running Gear 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. "