What is a hipster? Look at this fucking hipster...

Back into the fray with more knee theories: https://www.prevention.com/health/health-concerns/winter-knee-pain

at-risk groups include people whose skin has little or no exposure to the sun, like those in care homes, or people who cover their skin when they are outside.

You weak-at-the-knees folks riding around in tights all year are probably just deficient in vitamin D. Get your knees out and get a winter tan going

Edit: from one of the most metal academic journals around, the Clinical Journal of Pain