This video shows the hit and hold drill. Most golfers struggle to produce consistent clubhead speed or fail to make repeating solid ball contact. You can use this drill to establish better arm/body relationship during your swing which will lead to power and accuracy and certainly reinforce impact.

When you perform the hit and hold drill I want you using a 6,7,or 8 iron, making half to three-quarter swings. If you are unable to stop your arms waist high post impact, then it is likely they are working independently of your torso. Practice this drill and I can guarantee you will start to feel how important it is to allow the pivot (body turn) to control the arm swing.