Lift like a weightlifter!
Weightlifters know better how to do it: lift. When a weightlifter does not perform the lifting action correctly. 'Shoot' it is his back or is he overloading his knees. Place your feet in a light spread position ('pelvic width'), actively make your back hollow, hold the weight close to your body during lifting and look up (stretching, activating the spine). Do not fall all the way through your knees, because you will never get up with a large weight.