Provided are an exercise management method and server thereof. The exercise management method includes providing a notification that an exercise mode is set with respect to a first exercise machine from among a plurality of exercise machines and setting a second exercise machine arranged within a predetermined distance from the first exercise machine from among the plurality of exercise machines in a lock mode.

Methods, devices, and systems related to determining a player count at a pickleball court are described. In an example, a method can include receiving an identification (ID) of a pickleball court at a server database from a first computing device in response to the first computing device scanning a quick response (QR) code, determining a player count at the pickleball court on the server database that hosts an application in response to receiving the ID of the pickleball court, and displaying the player count at the pickleball court on a second computing device running the application.