Courteney Cox created a bit of a nostalgia driven stir when she posted a new workout video that didn't have the best ending.MORE: Jennifer Aniston shares surprising revelation about Friends' costume choicesThe actress posted a reel to her Instagram showing off her skills on the tennis court, which ended with an unexpected disaster.WATCH: Courteney Cox's tennis accidentThe video starts with Courteney perfectly hitting back a ball that's tossed to her from off-screen.