The short answer is "it depends". Back extension machines can be a helpful form of exercise for strengthening the muscles in your back, core, and glutes. However, care needs to be taken to ensure that you are using correct form and technique to avoid injury.
When using a back extension machine, here are a few considerations:
• Make sure to use the machine with correct form and technique - incorporate controlled movements, breathe during the exercise, and do not arch your back more than it needs to be.
• Start with a light weight and increase weight gradually towards muscle fatigue to strengthen safely.
• Incorporate exercises to target other areas of the body alongside back extensions and talk to a trainer to ensure you are properly utilizing the machine.
• Only use the machine if recommended by a Certified Personal Trainer or Physiotherapist.
Overall, the back extension machine can be good for your back as it can help to strengthen the muscles supporting your core and lower back. But, it is important to follow the above advice when using the machine and only do so under the direction of your personal trainer or physio.
For more information, you can check out this article: "Do Back Extension Machines Really Help Your Back?"
https://www.spine-health.com/blog/do-back-extension-machines-really-help-your-back