Roller Ball

Rollerballs is a recurring endurance challenge that originated in.

Rules
The castaways must stand on a small log while balancing a ball on a wooden disc. At regular intervals, one more ball will be added onto the plate until there are three balls, which will increase difficulty. If at any time a ball falls off the disc or a castaway loses their footing on the log, they will be eliminated. The last castaway standing will win Immunity.

History
The challenge was first introduced in Survivor: Redemption Island as the first Individual Immunity for the new Murlonio tribe. Natalie Tenerelli won the challenge, outlasting Mike Chiesl.

The challenge was re-used two seasons later in Survivor: One World, where it was once again used as the first Individual Immunity for the new Tikiano tribe. Troyzan Robertson won the challenge, outlasting Kat Edorsson.

Trivia

 * Both times this challenge was used....
 * It was used for first individual immunity.
 * The tribes merged into black tribes made of 12 people
 * The last woman standing was the youngest woman overall.