It's hard to say exactly what the situation is, but there is definitely one thing: you can't bend your waist. Simply put, it is straight, and the cliff cannot be bent. Even if you dribble low, you can bend your back or not. As long as your waist is straight, your center of gravity will be stable, even if the ups and downs are controllable. Of course, dribble, don't look down at the ball, look at the ground. This is basic.