Here’s a great stretch if you have issue with inner knee or medial knee pain. Just about anyone can do it without risk of making anything worse. The important thing to remember when it comes to this stretches is making sure your back stays in neutral.
In the photo below, notice the orange arrows. That’s the adductor Magnus, it’s the primary muscle we’re trying stretch in this video. The adductor magnus actually helps as acting almost like a “4th hamstring,” in many movements – especially at the bottom of squat.