This is a yoga chair. please log in to view this image They're not usually used by most people for yoga. Actually, I picked a bad one. Usually more a dip in the centre so you can have a better variety of angles. They're normally low to the ground and fairly narrow so you can have one foot either side of the chair... sometimes they have metal loops that you clip straps to... those are most certainly not intended for yoga. That kind I'm sure Nozzer does indeed have in his basement.
That's the point of the Yoga Chair, makes certain options easier and more fulfilling than existing furniture... ... for yoga.