I do the lotus position one a lot; I have my laptop on the dining room table and our chairs don't have arms.
Can also vouch for the value of sitting on an exercise ball except for one point: to sit correctly, your hips and knees need to be at 90 degree angles. This often puts you a little bit low at your computer desk, and your shoulder can get very sore from reaching up to the mouse. So adjust your chair/desk heights properly, or you can land up hurting, from trying to do something healthful (ask me how I know this--lol)
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