indesertum, those are power cleans not (squat) cleans, but they're pretty good for learning on your own. Make sure you get that triple extension, hips, knees, ankles. Also, make sure your feet don't leave the ground for too long because you can't exert any force on the bar when you are off the ground. I hate when it's described as a jump, because it really isn't. You ankle should be in full extension before you shift your feet to the squat stance. Also, make sure you get thigh to bar contact as this will keep you from using too much arm, your hips really need to pop through more.