Cheerleading has evolved over the past twenty years from being an activity where members were selected based on their popularity to one that now claims some of the more talented athletes at school.Today, cheerleading involves skills which require the strength of football, the grace of dance, and the agility of gymnastics. Complex maneuvers are performed which challenge the limits of the body. Safety organizations such as the AACCA were formed to develop safety rules to guide programs in the safe performance of cheerleading gymnastics, which include jumps, partner stunts, pyramids and tumbling.