Weekly Informal Challenge number 213 is "Movement":
Thanks to Lynn H. for this theme. She more specifically said "combine movement and stillness in a single shot". This weekend go panningforphotographic GOLD. If you prefer feel free to FREEZE some FAST action or use a long exposure to create and capture slower less visible motion. Please keep it FRESH. If you're participating in the May: "Water/Liquid" challenge, this can be used to work on both at the same time. Remember (most of all) HAVE FUN.
Here is a good short YouTube video on panning.
(link to guidelines if needed)