Do not slouch in your chair but try to maintain an erect posture
with your tummy tucked in. Slouching is a very bad habit. Not
only is it bad for your back but it also gives you a very flabby
figure. It is your way of saying yes to a comfortable, weight-gaining
pose.
Make it a point to always sit as erect as you can. It is also
a terrific way to ward off back problems.