Irons 1-4 are considered long irons, 5-7 are mid irons, and 8-PW are short irons.

There's 2 schools of thought on ball placement.

One is that your feet are static (the go in the same place every time) and the ball moves - inside the left heel for woods, one ball width back for long irons, another back for mid irons, and slightly ahead of the middle of the stance for short irons (and right in the middle for wedges).

The other is that the ball is static (lined up with your heart), and your stance gets more and more narrow as you progress - the logic being that the longer clubs require a more stable base (wider feet), and as you progress through your clubs, your stance gets more narrow.

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True Length Technology Fitter - www.truelengthtechnology.com
It's live! - www.ShipShapeClubs.com
PCS Class 'A' Clubfitter

A new highlight: Golfing the home course on Christmas Day.

I say it too often: If it's golf club shaped, you can play with it.

For the record, I'm a club doctor, not a swing doctor.