Any position that gets you on the floor is great. Read on the floor, eat dinner at your coffee table, talk on the phone while on the floor, watch TV while on the floor ... there are many positions you can use: Seal pose or Sphinx for TV watching or reading, Straddle, Cross-legged sitting, Caterpillar, make up your own pose. I addressed this concept here:
http://www.yinyoga.com/ys1_2.2.7.2.5_spinal_curves.php
Here is an excerpt:
One remedy - stop sitting in chairs! If you love your back, if you want to strengthen your spine and open your hips (another problem area for most Westerners), start sitting on the floor every chance you get. Give your chairs away. Live as close to the ground as you can get. Eat at your coffee table, read with books on the floor. Watch television while lying on the floor in seal pose.
One caution: move. It is okay to hold any one pose for 5 minutes or so, but switch around every once in a while. Don't stay in any one pose more than 5 ~ 10 minutes. And, naturally, if you experience any pain, don't do that pose. You may need to work up to living on the floor for long periods of time. Be gentle, but persistent.
Enjoy your floor.
Bernie