Nearly every catching instructor you speak to, and every published book and article on catching, will point out that footwork is the key to success for a backstop.
However, most of these sources either don’t elaborate on how your feet should be, or they offer information that does more harm than good.
For example, I remember being taught to get my weight forward, on the balls of my feet, because that is a “strong athletic position”. Unfortunately, with your weight forward you can naturally move only one way: forward. If you need to block a ball to either side, or need to throw a runner out, you will have to waste time shifting your weight back before doing anything else.
That’s not to say, however, that your weight should be back on your heels (though, you’re probably better off back there than forward). Instead, your weight in the catcher’s stance — both with and without runners on — should be evenly distributed on your feet. A better way to say this may be that your weight should be ON TOP of your feet.
Ideally, your toes should be pointing up the the foul lines, positioned outside your knees, with the outside edges of your feet slightly off the ground, and the majority of your weight resting on top of your instep. While at first it may feel strange to have your weight on your insteps, you should otherwise feel balanced. Set this way, you will be an ideal position to move in any direction necessary, with quickness and control.