Gently swaying until your body stops may allow you to find your center of balance naturally. Mouth closed with lips and teeth together. Rest your tongue on the roof of your mouth. Hands can be placed in several positions. All, though, came back to the same thoughts.
Proper posture is tantamount to breathing.
Breath, if this is what is used for focus, must be natural and easy. We can also do a meditation practice in walking. We try to experience walking as walking. We pull our breath into our bellies, our spine straightens, our breath is full and regenerative. We walk when walking and we breathe when breathing.