Some evidence suggests reclining at your desk is a better option than sitting at a 90-degree angle (though I found it challenging ). This workspace features a desk that can be used with a recliner chair or as a standing desk.
Flickr user Designcutter built this desk and shelving system with IKEA poles -- without fixing them to the room (which is rented). Although it's a small, narrow space, there's a lot of flexibility in the room, with the monitor arm allowing for viewing anywhere in the room and, of course, that reclining option. You can view more photos of the minimalist workspace at the link below.
Minimal workspace [Life Design Edit]