Maintaining good form throughout the deadlift motion is the best way to avoid lower back pain while exercising. Here are some tips:

Head Position: Keep your head in a neutral position, looking down at the floor with your chin tucked as you set up to begin a deadlift. The back of your head should align with your flat, straight back and spine.

Knee Alignment: As you reach down for the barbell, ensure your knees are aligned with the middle of your feet. This helps maintain proper form.

Exhale Fully: Before lifting, exhale fully to engage your abs and obliques (known as the anterior core). This stabilizes your spine during the lift.

Hip Hinge: Remember that the deadlift is predominantly a hip-hinging movement. Focus on engaging your glutes and hamstrings rather than relying solely on your spinal extensor muscles.

Remember, good form is key to preventing lower back pain.