Final answer:
The nonemergency exit technique that should be practiced in training until it is second nature is crawling through the aisle.
Step-by-step explanation:
The nonemergency exit technique that should be practiced in training until it is second nature is crawling through the aisle. Crawling through the aisle is a safe and efficient way to evacuate during an emergency situation, especially if there is smoke or fire present. It allows for a low center of gravity, making it easier to navigate through the space and avoid obstacles. In addition, it helps to minimize the risk of inhaling smoke or toxic fumes.