you do not have to be flexible

The most common reason people give for not coming is that they aren't flexible. It's a bit like saying you can't go to the doctor until you feel well.

Every shape in every class here is offered at three heights: on the floor, on a block, or in a chair. All three are the pose. The block is not a downgrade; it is how the shape becomes available to the body you have today.

If you can breathe and you can notice, you have everything the practice actually requires.