Mechanical bulls have existed for decades as a training device for rodeo competitors, as they enable a rider of rough stock (bucking horses and bulls) to enhance rodeo performance and refine skills without the risk and unpredictability of a live animal. Although mechanical bulls are still routinely used for rodeo training, they are also utilized as an amusement ride, both as a mobile rental (i.e., party entertainment) and stationary entertainment found in bars, restaurants, and clubs; these may be surrounded by an blown-air inflated structure similar to a "bounce house" or foam pits for safety. There is a modified, less dangerous style used for children's parties, usually with a one-minute timer. Children remove their shoes to get on. They hold a rope or peg on the shoulder or neck of the machine, and the person who stays on for the whole minute without falling off wins a small prize.