You kinda just generally lean forward.
You use a low bar position, with the elbows kinda back, which makes you lean forward.
You wear raised heels, which put you on your toes, and encourages your knees come forward. This makes you lean forward more.
No belt, so the front of your body is not super tight, which causes you to lean forward more.
At the bottom, everything is so forward, your butt has to wink under to get any kind of leverage. Your knees and the bar are so far forward, your hips have to come forward/underneath to get under the bar.
So maybe belt up, put the bar up on your shoulders, stand up straighter?