Romain, or just a general deadlifts, are one of the best exercises you can do to build strength. But so many people can’t get the nack to the deadlift. It’s a basic human movement pattern using a hip hinge movement.
The hip hinge is exactly what it sounds like, hinging at the hips. It's not sitting down, but more like sitting back. This is one of the main things that makes it different from a squat. The movement comes from your hips, not your knees. It's like a horizontal thrust, your bum goes back as you sit back and you drive all the weight on the heels till you feel the fire in those hamstrings then you fire your glutes forward as you stand up. Here’s a great one I always do. I come a few inches from the wall and try push my bum back towards the wall as I bend from the hips.