Belen talks about using a wide stance at address, but if you look at the photo in that section of the article (or even the photo above) you'll see that her "wider than shoulder width" stance isn't as wide as many of you might assume. As she says, if you get too tense, you'll cut down on your ability to turn.
When she talks about making a big arc on her backswing, she's talking about keeping "her hands in front of her." If you pay attention to what you read, you'll see that she's simply keeping her upper arms lightly against the sides of her chest on the way back and as she swings down. That's basic Hogan technique and, while I think some players overdo it and get too tense, that's what most good players do on the backswing until their hands are just below their shoulders. That's how you get a big shoulder coil, and that's what she wants you to do here.
Finally, this is the most unusual thing she says:
When I swing down, my left leg is locked and pushing hard into the ground for leverage to create more power. Also, my upper body is almost completely behind the ball's position through impact. I've shifted my weight into the left leg (that's why it's straight), but I'm putting as much body weight into the hit as I can. I'm not really swinging my fastest until the ball is struck. My swing speed is building until then.Her left (lead) leg is locked during her downswing. Do you understand that? Essentially, as soon as her lead heel is planted flat on the ground when she starts her downswing, she straightens her lead knee so she's pushing down with that foot. If you do that, you CAN'T slide your hips very far forward on the downswing! The fact that she says her upper body is still behind the ball at impact emphasizes this fact. This keeps you steady over the ball and should help your accuracy as well as your distance.
Belen carries the ball 240 yards off the tee vs 219 for the average guy on the weekend. If you're looking for some extra distance, this might be worth a try. It's definitely not a difficult technique to learn.