Harness racing use a standing start. The sulky (informally known as a "bike") is a light, two-wheeled cart equipped with bicycle wheels. The driver (not a "jockey", as in thoroughbred racing) carries a light whip chiefly used to signal the horse by tapping and to make noise by striking the sulky shaft. There are strict rules as to how and how much the whip may be used; in some jurisdictions (like Norway), whips are forbidden. For exercising or training, the drivers use what is known as a "jog cart," which is a sulky that is heavier and bulkier than a racing unit.
Horses in the Middle Ages an acre per day, but a horse team averaged a full acre per day. For farm work, such as ploughing and harrowing, the draught horse utilized for this purpose was called an "affrus" (or "stott"), which was usually smaller and cheaper than the cart horse. While oxen were traditionally used as work animals on farms, horses began to be used in greater numbers after the development of the horse collar. Oxen and horses were sometimes harnessed together. The transition from oxen to horses for farm work was documented in pictorial sources (for example, the 11th-century Bayeux tapestry depicts working horses),