How to do properly classic deadlift?

1. Stand with your feet hip-width apart, toes pointing forward, and the barbell in front of you on the ground.

2. Bend down and grip the barbell with an overhand grip, hands slightly wider than shoulder-width apart. Your palms should be facing down, and your arms should be straight.

3. Keep your back straight, engage your core, and lift your chest. This is your starting position.

4. Take a deep breath and brace your core. Begin to lift the barbell by driving your heels into the ground and extending your legs. Keep the barbell close to your body as you lift.

5. As the barbell passes your knees, begin to straighten your back and squeeze your glutes. Keep your shoulders back and your chest lifted.

6. Once you're standing up straight with the barbell, pause briefly and then begin to lower it back down to the ground by reversing the movement. Keep your back straight and engage your core as you lower the barbell.

7. Repeat for the desired number of reps.

It's important to maintain proper form throughout the deadlift to avoid injury. Keep your back straight and engage your core throughout the movement. Make sure the barbell stays close to your body as you lift it. And, choose a weight that challenges you but allows you to maintain proper form. Finally, remember to warm up before performing any weight-bearing exercise and stretch afterward to help prevent injury.