Firelog pose can be an excellent stretch for the glutes (buttocks) and outer hips. I find it particularly useful after a lot of cycling. The full version of the pose isn’t physically possible for many people because it requires that
Stretching the glutes after a long cycle
After my first multi-day mountain biking trip, my glutes (or buttocks) were in agony. They became tight both from working hard and also being pulled at the same time by my back muscles as I leaned forward on the bike.