So what was going on with that muscle knot? I’m an exercise physiologist. The goal of much of my research is to understand how different movements and forms of exercise place stress on the muscles.

You might think flexibility is something you're born with -- you either have it or you don't. While your flexibility level ...

And a new study notes that at the very least, taut bands of muscle can be seen with high-tech imaging techniques. Yet even those who argue that knots do exist as we commonly understand them ...