“Simply sitting with legs closed, especially for a relatively short commute, should be fine.”
Yet crossing our legs isn’t always comfortable.
Perhaps the biggest reason to not always keep your legs crossed has to do with your health.

It can also cause an increase in blood pressure.
However, placing an ankle on a knee can increase blood pressure, as per theJournal of Hypertension.
Hypertension that results from crossing your legs is transient so it goes away when your legs are uncrossed.

The result is a lot of back pain, not to mention poor posture.
Sitting with knees pressed together can even be problematic.
It can actually encourage knock knees to develop.
