The ready position described above creates a couple of problems for the fielder. It's not very comfortable to be that low, which can cause tension, not only in the legs, but in the arms and hands as well. It's not the best position to be ready to move. You're certainly not going to stay that low as you go after a hard ground ball hit 15 feet to your right. The ready position is an athletic position that allows you to move quickly in any direction.
Many players have their palms facing each other at the ball crosses the plate.
Most players devise a pre-pitch routine that puts them in the ready position as the ball crosses the plate. This may be a shuffle of the feet or a little hop. Whatever method you use, make sure you're balanced, comfortable, and ready to move. Get your momentum moving forward. Don't sit back on your heels.