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The article said:

> “Every joint in our body has synovial fluid in it. This is the oil in our body that provides nutrition to the cartilage,” Jam says. “Two things are required to produce that fluid: movement and compression. So if a joint doesn’t go through its full range—if the hips and knees never go past 90 degrees—the body says ‘I’m not being used’ and starts to degenerate and stops the production of synovial fluid.”