A new wave of research is showing what the old gym myths about stretching got wrong—and what you really need to do to reap its benefits.

When we think of the word flexible, we may think about yogis twisting themselves into a pretzel knot or that one friend who can drop into a split at a moment’s notice, thanks to past gymnastics ...

Regularly doing wall sits can improve your joint flexibility, especially in the knees and hips. The static hold stretches ...