To lift heavy object correctly means protecting the back and waist from strain and the ensuring that the full loading on you is on the muscles (of the legs and hands).
To lift correctly, come as close as possible to the load. Keep the back as straight as you can. Lower the waist as low as possible and position your legs to carry the loading on you. Grab the load and lift. Spring and move your legs to reposition to required position.
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you lift a heavy object by using the strength in your knees, rather than using the strength in your back. bend your knees to the ground, get a good grip of the object (use protection gloves if needed) and slowly but carefully un bend your knees and stand up straight. This protects your back from going out and causing strain on it.