It is a constant sound that is made up of two different sounds, one of them having small pauses in the same interval. It was activated with the start button on the treadmill.
This audio was taken on the subway train. I wanted the audience to picture a scene in which someone is sending a text message in order to meet up with a friend.
Recording of a plastic tube swinging. Usable as a sword slashing sound. Recorded in audacity using samson go mic microphone. Cleaned up for convenience.