I have never tried standing while using my dsm. Sometimes on a difficult seam or whatever, I really need to get my eyes right there to makes sure that stitch goes in the right place and I would think that standing would really make that hard, but never having tried it, I may be wrong. Never really thinking about it until now, I sort of rest my wrists on edge of table when sewing a long seam......it just never entered my mind to stand. But, I do have a L/A and stand there, but that's because the machine is moving over that stationary fabric and I'm the guide....(not computerized), what is that ergonomic rule about elbow bent at 90 degrees, is correct height of table work while sitting.....????