The last thing you want to do is try to steer your driver in play, says PGA Tour pro Ben Griffin.

“But on the flip side, if your swing gets too loose, you risk hitting the ball off the map,” he says.

So how do you find the balance between being too restricted and too wild? Griffin thinks the key might be your left foot.

Avoid the left foot ‘spin out’

“When my driver just isn’t working, it’s often because my left foot is spinning out as I swing down,” says Griffin, who finished second at the RBC Canadian Open earlier this season. “I’m rotating my body pretty fast to get through the ball, and my toes go from facing the ball to facing the target. It’s an unfortunate byproduct of trying to generate more power, and I see a lot of amateurs making the same error. There’s nothing wrong with having good body rotation—at least you’re not steering with the arms only—but you have to control it.

Left heel grounded through impact

“To help stabilize my lower body, I spend a lot of time with my trainer, Randy Myers, working on balance and one-legged exercises. I also focus on my lead foot—in particular my left heel—and I think that work can help your ball-striking, too.”Griffin says the more you can rotate your body in control, the more fairways you can hit. Try this move.

“For me, the key is that my left foot, particularly my left heel, stays grounded as I swing down. Mine eventually lifts a touch, but not much. When you go to the range, hit your driver with the thought of keeping that heel down. Feel like your body is pivoting around it and that pressure is moving upward through that leg. That’s how to swing harder without spinning out.”

For more on Griffin, here’s an analysis of his driver swing.

This article was originally published on golfdigest.com