Let me just clear the yogic air: yoga is not an acrobatic competition, whereby only the lithe and lean can participate in pretzel-like poses, vying for the title of 'Most Flexible Femme Fatale.' Nay. Nay, nay, nay.
Allow me to go Cliff Claven-esque for a moment:
It's a little known fact, that the yoga asanas (poses) were actually created (5000+ years ago) so that yogis (people) could sit longer in meditation (prayer). That's it. Many of these confounded poses and practices that scare us off are much thanks to our Western philosophy of 'more is MORE!'
The intention of our yoga practice is to go within. By focusing on your breath and physical body, you will start to untie the knots around your heart (anahata) as well as wrangle the incessant chatter (chitta) of your mind.
The goal is to realize that you can be uncomfortable in a pose and still find ease through your breathe and then eventually find ease in the pose. Herein lies the blueprint for life: in any situation if we can find our breath...we can find a place of ease.