What has a vault but isn’t a bank?

Riddle Explanation:
The riddle, “What has a vault but isn’t a bank?”, cleverly refers to gymnastics. In banking, a vault is a secure place to store valuables, while in gymnastics, the vault is an apparatus used for performing acrobatic moves. This riddle plays on the double meaning of the word “vault,” making it both a fun and thought-provoking puzzle.