The recommended method for lifting a heavy object is to:

Lifting a heavy object using the recommended method of bending at the knees and keeping the back straight is essential for preventing injury and ensuring proper body mechanics. This technique allows you to engage the stronger muscles in your legs rather than relying solely on the back muscles, which are more prone to strain and injury when lifting heavy loads.

By bending at the knees, you lower your center of gravity, making it easier to hold the weight close to your body, which further reduces the risk of back injuries. Maintaining a straight back helps to align the spine properly during the lift, providing support and minimizing the chance of injury.

In contrast, lifting with a rounded back or relying solely on the back increases the likelihood of injury, as the back is not designed to bear the majority of heavy loads in that position. Quick lifting may create momentum, but it can lead to loss of control and further increase the risk of injury. Using a partner can be helpful in some situations, but it is not always a practical solution for every lifting scenario. The safest and most effective method remains using proper lifting technique by engaging the legs and keeping the back straight.