I think your question should be, "should I be sitting so long?" There's ample evidence that extended sitting, especially relative to the amount of standing and

I think your question should be, "should I be sitting so long?" There's ample evidence that extended sitting, especially relative to the amount of standing and walking, is detrimental to health (especially including weight). I spent years on the popular Herman Miller Aeron chairs, but eventually I developed lower back problems in my early 30s! So when I left my job and started working from home, I tried the standing desk thing... Indeed it takes time to get used to standing a lot, but I've been doing it now for the better part of 13 years. Even without proper (or consistent) exercise, I'm more fit than most of my peers. And when I pushed and pushed my finance company to get adjustable height desks, many of the naysayer employees eventually started standing for as much as half of their days. It's especially good after lunch when you're full and your body wants to just shut down and sleep. Ikea makes a great, cheap, manual adjustment standing desk. Keep a chair or stool nearby for when you do really get tired. But give standing a try (for more than a few days). Also, get a good padded mat to stand on. You can get a good one for $30. You back, heart, legs, and mind will thank you.