I asked that very question to Karen Allen, the star of the Raiders of the Lost Ark series. She ran a yoga studio for several years and still loves doing yoga! She is an amazing woman
She said:
"Janu Sirasana [sitting, bringing your head to your knee] is one of my favorites just because it felt so great in terms of both stretching my hamstrings and lower back - who doesn't need that! Tadasana [mountain pose] is a fantastic pose just because it's really the most simple and yet the most difficult pose. Shavasana [corpse pose] is also a favorite pose because it's really the reward of your practice, the shavasana where you just lay down in a pose at the end of your practice. If you've done a good practice and if you've been really focused and you've breathed really deeply and clearly and if you've really opened up your system, you can actually have a profound experience of your interior self. You can actually have a unique thought! Which is hard to come by these days, we're so in constant response to things around us, we're so over stimulated by our environment. It's so rare to have a thought that isn't stimulated by something we're taking in through our eyes or our ears."