Barbell deadlift:

Barbell deadlift

Band your knees and bend forward while keeping your back straight and grab the bar with your palms facing down and with a shoulder width grip. That is the starting position  Now, as you breathe out, push

with your legs and simultaneously get your torso in an upright position, now bring your shoulder blades back and stick your chest out. Now, as you breath in, bend your knees and lean forward getting in the starting position. That is one repetition.
IMPORTANT: never round your back or you can get injured, also if you have any back problems do not do this exercise.