Tension is by far the biggest killer in the golf swing, gripping too tightly, standing in your set up too long, you need to keep your body in motion and relaxed to properly strike a golf ball
Use this shadow drill to get your weight behind the ball and hit higher shots
A common mistake on the backswing is to hinge instead of cock your wrists, a perfect drill to help fix this is to pre set your backswing by cocking your wrists right up in front of your face at address and then turning into a full backswing