It's commonly known as runner's knee, but you don't have to run to feel the pain of patellofemoral syndrome (PFPS). This condition occurs often in young athletes and female athletes especially.

If you equate step aerobics with leg warmers and spandex, well, you’re not wrong—but you’re stuck in the 1980s version of it. As TikTok videos that have amassed millions of views show, the retro ...