When you have no choice but to sit, try switching the slouch for a straighter spine, and when you don't have to be bound to your seat, aim to move around much more, perhaps by setting a reminder to yourself to get up every half hour.
Cuando no tengas más remedio que sentarte, trata de cambiar la postura desgarbada a una columna vertebral recta, y si no tienes que estar atado al asiento, intenta moverte mucho más, tal vez con una alarma para recordarte que debes levantarte cada media hora.