Balance is as important in golf as it is in tightrope walking. Look at the way I'm addressing the ball here. If you took the club out of my hands, I'd fall flat on my face. My stance is slightly exaggerated, to make the point, but the point is true: all too many players do not distribute their weight properly during their swings. At address your weight should be distributed evenly between toe and heel, just as it would be if you were standing around talking with someone. If it isn't, chances are your whole swing will be off-balance, thus producing the kind of off-balance shot that can ruin a round.
To check your balance, simply stop yourself at some point in your swing—any point from address to follow-through. At that instant you should be able to take the club and move it in any direction without falling over. If I were balanced properly for the shot shown here, I would be able to pick the club up, wave it, throw it down, any thing. So balance yourself, and at the same time balance your golf swing.