Nurses can maintain proper lumbar support through various methods: 1. Ergonomic Seating: Using chairs with built-in lumbar support while sitting for documentation or breaks. 2. Proper Lifting Techniques: Using the legs rather than the back to lift heavy objects. 3. Lumbar Cushions: Utilizing portable lumbar cushions or supports when using non-ergonomic chairs. 4. Posture Awareness: Regularly checking and correcting posture to ensure the natural curve of the spine is maintained.