When moving furniture technique is very important. Bending at the knees, and using your legs while lifting heavy objects is of utmost importance. The legs are the strongest muscles in the body, and need to be incorporated into any heavy lifting. The mistake most people make is to bend from the waist, and unnecesarily strain their backs. This can cause back problems even when lifting light objects. So remember, save your back and bend your knees. Use the strongest muscles(your legs) in your body when moving, and your back will thank you!