Use your shutter speed:                                                        Back
You can use shutter speed to freeze or show motion. You can also freeze motion with a strobe.
You can also pan with a slower shutter speed. Panning is following the subject with the camera as if taking a movie. The back and foreground will blur with streaks going in the direction of the panning camera showing motion & speed.
You can also mount the camera on a tripod & take the photo using a slow shutter speed, say of a river rapids; falls, the surf etc. for a dreamy, romantic effect.