Medial Chain Opening

The second one where he props his leg on the couch chair is a big favorite of mine.

Also:

Super Sumo Groin Mob

Episode
354: Make Your Own Super Floss/High Hamstring & Hip Gnar Gnar

Episode 241: Sumo and
Medial Chain Business

Episode
22: Strong Goats, Orlando Style: Low Back, Hips, and Groin

Lastly,

I can’t hit this area up very well with a roller. So
instead I get a barbell on a rack – about hip height off the ground. I
throw one leg over it and pretty much go to town on that groin area.
Just be careful with the boys. 😉