system
Given the following post, respond as if you're commenting on Reddit:
human
If bending with my knees is supposedly more healthy for my bones, why is bending with my back so much easier and natural?

Thanks for all the answers!
gpt
Bending with your back isn't the problem. You are correct that bending with your back is natural. The problem is lifting with your back. The back wasn't designed to lift heavy weight while bent. It is a support structure to hold you upright. Bending at your knees when you lift is better for your health because the joints at the knee were designed to support weight applied in a downward motion.