主题：30 -- 虽远必诛

Thank you very much for the prompt reply.

Well, what I had in mind is more like this one and can be had at a comparable price as office chairs (well below $100):

<img src="http://www.lifestylesrt.co.uk/csp/timscris/radiotimes/products/large/7771.jpg">http://www.lifestylesrt.co.uk/csp/timscris/radiotimes/products/large/7771.jpg</img>.

I can certainly see all the problems in the image you provided. However, for this one, one could actually distribute the body weight on three well placed surfaces (arguably better than one surface) without having a high hip flexion and with a basically flat sitting surface. It does look quite simple and low-tech. One problem is that you cannot lean back and relax on this kneeling chair.

I really enjoy your serials and have recommended them to some of my friends who sorely needed the knowledge you provided here.