Keeping your weight on your trail leg for too long causes a lack of stability and weight transfer, leading to the hands taking over and lots of flipped and scooped shots.
The drill
To get a feel for how your weight shifts through the swing, grab a mid-iron and take your normal stance with the ball positioned level with your left leg (for right-handers). From here, move your right foot back behind you with just your toes touching the ground. Take a few short practice swings to get the feeling of your weight being stable and over the ball at impact. Then, start hitting some half shots from this position. Having found the feeling, try recreating it at impact in your full swing with your feet back in their normal position. You should start producing better strikes in no time.
