You’ll hit the golf ball farther if you keep your lead arm straight. If you’re right-handed, your left arm is your lead arm because it’s closer to your target as you address the ball.
Line up for your shot, getting a comfortable grip on your club. Then, before starting your takeaway, confirm that your elbow and wrist are in line with your shoulder and your club.
Creating a straight line from your shoulder to your clubhead will increase the radius of your golf swing. When you increase the distance of your swing arc, your swing speeds will also increase.
Think of driving your car around a bend. If you drive along the lane closest to the curve, you’ll travel less distance than if you take the outside lane. To get around the curve in the same amount of time, a car in that longer outside lane will need to travel faster.
Keeping your arm straight is like putting your clubhead in the outside lane. It will travel faster, resulting in a faster swing. The faster swing delivers more power when you hit the ball.
The force of your faster club will result in your golf ball traveling faster and farther.