Slow down your shutter speed, the reason for motion blur is simply that your camera’s shutter remains open for a significant period of time. In other words: you get motion blur when your shutter speed is long, whereas you freeze the action when your shutter speed is short. If your shutter speed is too fast (e.g., 1/4000s), you’re not going to capture much movement. But if you dial in a lengthy shutter speed (e.g., five seconds) you won’t need your subject to move much at all before you start to see blur.
The other factor that comes into play when determining shutter speed is how much light exists in the scene. A longer shutter speed lets more light into your camera and runs the risk of blowing out or overexposing your image. Below, we’ll cover some ways to let less light in (so you can use long shutter speeds without overexposure concerns).