chin in and shoulders down;
straight back; chest out stomach in;
hands and arms relax and disconnected the weight on them from your shoulders;
hips – when sitting — on the same ‘platform’ sit on the tailbone;
hips – when walking and standing — reserve the tailbone’s natural curve;
feet – sitting – both feet touch and rest on the floor, if you can’t do so because the chair is high, in a long period of time, it’s better to cushion up the floor;
feet – walking and standing – both require the whole body’s weight to distributed evenly from your outer to up and inner sole to the heel. NOT only your heel !
FINALLY, which ever action it is – sitting, walking around or standing – most of all parts of your body need to stay relax, no pain and you feel good 😉
Correct 1 by 1 if it’s not possible to do all at once, see if your stiff neck, aching shoulders, back pain and heel pain will ease?!