If you have to sit for long periods of time, get up every 30 minutes or so to stretch your back.

If you must sit for prolonged periods, take a break every hour.

He still needs to stretch his back an hour a day and has trouble sitting for even short periods of time.

We also developed the ability to sit very quietly for long periods of time.

The three of us women sat for long periods without talking, while Sam played in the sand.

Position involves sitting or standing for long periods of time.

But this is, after all, a President who can sit quietly for only short periods.

It may hurt to walk, exercise, or sit for long periods of time.

If you must sit for long periods of time, take breaks.

He was not used to sitting for long periods of time.