Absolutely, being sedentary is actively harmful. And it's amazing how long these things can take to recover once you're in your 30s. I got patella tendinitis i

Absolutely, being sedentary is actively harmful. And it's amazing how long these things can take to recover once you're in your 30s. I got patella tendinitis in both my knees, after a decade of sedentary indolence, followed by an extreme reentry into exercise. It took nearly a whole year to get my knees right.