2026 AAAI-ISMA Personal Trainer Certification Complete Practice Test

Keeping the bar close to the body and using the legs to generate the lift is the best way to protect the lower back. When the bar stays near your center of gravity, the load creates a smaller moment arm at the spine, which means less bending and shear on the lumbar area. Driving the movement with the hips and legs, rather than the back, engages larger, stronger muscles (glutes, hamstrings, quads) and helps you maintain a neutral spine throughout the lift. That neutral spine position reduces the risk of disc or ligament injury and gives you more control.

Arching the back increases stress on the lumbar spine by creating greater shear and compressive forces, especially with heavy loads. Locking the knees can take away the ability to absorb force through the hips and may push more strain onto the back, while moving the spine during the lift breaks the neutral alignment and undermines stability, raising injury risk.