Straight Lead Arm
Also known as: straight left arm, keep my left arm straight, keep your left arm straight, lead arm straight, left arm straight in the backswing, keep the lead arm straight
Your lead arm (the left arm for a right-hander) should be extended but not locked in the backswing. A firm, comfortable extension keeps the swing wide and the strike repeatable. A slight bend is common, even among tour players, and forcing the arm rigid adds tension.
The lead arm sets the radius of the swing. When it stays extended, the hands stay a steady distance from the chest and the club returns to the ball more reliably. When it folds a lot at the top, the swing gets narrow. The golfer then has to re-extend it on the way down. That adds a timing problem.
Straight does not mean locked. A rigid, hyperextended elbow creates tension in the forearm and shoulder and can shorten the turn. Many coaches ask for a lead arm that is soft but straight, the way it hangs when you reach for something on a shelf. A small bend at the top is normal for many good players. It is more common in golfers with less shoulder mobility.
If the arm collapses, check the turn first. Golfers who cannot turn the shoulders far enough often keep swinging the arms, and the elbow folds to make room. A slightly shorter backswing with a full shoulder turn keeps the width. After impact, the lead arm folds as the club swings up. Bending it early, through the ball, is a different fault called the chicken wing.
Tips by skill level
At address, let your lead arm hang naturally and extend it toward the ball without locking the elbow. Keep that same length to the top.
If your lead arm bends a lot at the top, test a slightly shorter, wider backswing on a launch monitor. Compare strike and club speed before deciding.
Example
An older golfer forces his left arm dead straight and his backswing feels short and tight. His coach lets the elbow soften slightly and asks for more shoulder turn. The swing gets longer and smoother without losing width.
Why it matters
An extended lead arm keeps the swing radius steady and helps strike quality. Knowing that a slight bend is fine stops golfers adding tension while chasing a rigid arm.
Common mistakes
- Locking the elbow so hard that the forearm and shoulder tense up
- Letting the arm fold to make a longer backswing
- Swinging the arms on after the shoulders stop turning
- Copying a tour player's arm position without the same flexibility
Frequently asked questions
Does my left arm have to be straight in the golf swing?
It should be extended but not locked. A firm, comfortable extension keeps the swing wide. A slight bend at the top is common, and forcing the arm rigid adds tension.
Why does my lead arm bend at the top of my backswing?
Often the shoulders have stopped turning but the arms keep going. The elbow folds to make room. A slightly shorter backswing with a full turn usually keeps the arm wider.
Is a bent left arm in the backswing bad?
A small bend is fine and many good players have one. A large fold narrows the swing and makes timing harder. That is worth fixing.
Related terms
- Lead Arm BendLead arm bend is too much folding of the lead elbow in the backswing. It shortens the swing's radius and reduces the width and stored power of a fully extended backswing.
- Chicken WingA chicken wing is the lead elbow folding outward through and after impact instead of extending. It usually compensates for an out-to-in path or a blocked, stuck downswing.
- Shoulder TurnShoulder turn is the rotation of the upper back (thoracic spine) and shoulders during the backswing. A full turn, near 90°, is the main source of swing arc and coil.
- BackswingThe backswing is the movement of the club from address to the top position. It creates the width, shoulder turn, and wrist hinge needed for power on the way down.
- ConnectionConnection means the arms and body move together, so the arms never get ahead of or behind the body's rotation. It keeps the arc and face delivery consistent.
- OverswingOverswinging means the backswing goes too far, usually past parallel, with the body losing its structure to get there. Signs include the lead arm folding, the grip loosening and the trail elbow flying. Stopping the backswing when the shoulders finish turning usually fixes it.
Related guides & benchmarks
Put this into practice
Ask SwingVantage a follow-up question about this, or keep reading the related terms above.