I agree, 82mph isn't bad at all. I personally hit a driver approx. 320 yards with a swing speed of 118mph and my 5-iron swing speed is right at 90mph but those are my natural swing speeds. If you're swinging a 5-iron at 82mph, I would advise against trying to force your swing speed. When you do that, you tend to lose your fundamentals. You will generally start transferring your weight by shifting your body instead of through roataion, you will generally start swinging off-plane, and your shots will go from being rather consistent (whether you're consistent with a fade, draw, or straight) to being all over the board with little or no control.


Stick with solid swing fundamentals, and work on core strength and flexibility...those 3 things (particularly flexibility) will naturally increase your clubhead speed without the pitfalls that come from trying to force your speed.