Which part of the body should primarily be used when lifting heavy objects?

When lifting heavy objects, the legs should primarily be used due to their strength and the biomechanical advantages they provide. The legs are designed to support the body's weight and generate the force needed to lift heavy loads. Utilizing the legs helps maintain a proper posture, reducing the risk of strain or injury, particularly to the back, which is more vulnerable to injury when subjected to excessive weight without proper technique.

Proper technique involves bending at the knees and keeping the load close to the body, allowing the muscles in the legs to do most of the work. This method not only optimizes strength but also ensures that the body's center of gravity remains stable, which is crucial for safe lifting practices. Therefore, focusing on using the legs not only enhances lifting capacity but also promotes overall safety in handling heavy objects.