This might be a slightly random question, apologies if so. I've been going to an ante/post-natal yoga class for a few months - all very basic, gentle stuff. However, I find it difficult to hold some of the floor poses for very long because... the floor's too hard! E.g if we're sitting, legs extended outwards along the floor, after a minute my heels really, really hurt (even if my feet are together on the mat it hurts, but if my legs are apart and my feet are off the mat on the floor it's agony!) . Or in other poses it's like I can feel the bones in my bum hurting as the floor's pressing them through the mat.
I'm not particularly carrying any extra weight (apart from a post-partum tum I'm slim), so I don't have any spare padding to act as a cushion. There are several even slimmer people in the lesson though and they don't seem to have an issue...
So is this a common thing? Am I being a wuss and just need to practice more?