You can flex your leg muscles without moving your legs. I wonder if this is enough to pump your blood around and if every hour there should be an alert telling you to do this.

From: https://www.mayoclinic.org/diseases-conditions/deep-vein-thr...

> Avoid sitting still. If you have had surgery or have been on bed rest for other reasons, try to get moving as soon as possible. If you're sitting for a while, don't cross your legs, which can hamper blood flow. If you're traveling a long distance by car, stop every hour or so and walk around.

If you're on a plane, stand or walk occasionally. If you can't do that, exercise your lower legs. Try raising and lowering your heels while keeping your toes on the floor, then raising your toes with your heels are on the floor.