Handstands are performed in many athletic activities, including acro dance, cheerleading, circus, yoga, calisthenics, and gymnastics. Some variation of a handstand is performed on every gymnastic apparatus, and many tumbling skills pass through a handstand position during their execution. Breakdancers incorporate handstands in freezes and kicks. Armstand dives—a category found in competitive platform diving—are dives that begin with a handstand. Swimmers perform underwater handstands as a game, with their heads, arms, and bodies underwater with their legs and feet extended above the surface, often having contests with the winner being the person who can remain in an underwater handstand the longest.