Sydney's working with Danielle on kick! You want to drive your kick from you hips, not your knees. It's also very important to focus on your upkick as well as your downkick. If you're only thinking about your downkick - which is what most people do - you'll drive your entire lower body downward in the water, as well as lose the power you should also be getting from your upkick. A balance between strong upkick and downkick will not only propel you forward more efficiently but also keep you in the proper body position during your freestyle.