Groin Flexibility Exercises

This is not for me, because I can almost do a split like this, and I can do a full front split on both sides.

My friend is trying to do side splits, but has trouble doing it. What are all the exercises you can think of?

I got: Splits, Side to Sides, and putting a leg up on a surface and stretching.

Here is a series I do quite often on my own and in my classes. Some of these stretches are a warm up but I suggest some other form of wraming up before you begin.

Px31IgPmeik

Andrew