For most people, running on a treadmill is enough of a challenge on itself. Taylor Swift decided to take it a step further in her commercial for Apple music.
Instead of just running on the treadmill she starts to rap. And that's when it goes wrong...
After rapping the first few lyrics of "Drake & Future - What A Time To Be Alive" she falls off the treadmill.
Because it's a commercial we may assume that it's all staged, but it still seems to hurt pretty badly.
Take a look at the video and try to imagine how much it must have hurt or just have a good laugh about it!