Jockeys stand and balance on the sled, using long reins as a whip and weight slabs under the feet of the jockey in place of a saddle. Each jockey must weigh at least ; if the jockey is underweight, slabs are added to meet the smallest weight. Horses are often deliberately stopped after the first obstacle, and given a chance to rest before being ushered to climb the second. A horse has not finished until the entire sled is behind finish line.