Harness Horse Racing
Almost all North American races are at a distance of one mile, and North American harness horses are all assigned a "mark" which is their fastest winning time at that distance. Harness races involve considerable strategy.
Track size plays an important part here; on the smaller half-mile and five-eighths rings common to harness racing early speed becomes a more important factor, while the longer stretch runs of seven-eighths and mile tracks lend themselves more favorably to closing efforts.
Usually several drivers will contend for the lead out of the gate. They then try to avoid getting boxed in as the horses form into two lines -- one on the rail and the other outside -- in the second quarter mile. They may decide to go to the front, to race on the front on the outside ("first over", a difficult position), or to race with cover on the outside.

