Shut off the glowing box, get up and dance to "Baby Got Back," by Sir Mix-a-Lot. You'll shake the knots right out of that rump.

Put an upside down drawing pin on the chair then you won't sit down for so long.

The most important thing is to take a break every so often. You can also use a pillow under you.
This probably means your chair is not adjusted properly.
Some people use a stand up workstation and a high chair.
There are some diseases that can cause this. You might want to get a checkup.

Never sit more than an hour at the computer without getting up and moving around. Sitting for hours and not moving is a good cause for blood clots due to the bending of the legs for so long.

Any long period of immobility--such as being bedridden from illness, recovering from surgery, or sitting for extended periods while traveling--is a risk factor for DVT and pulmonary embolism, says the National Heart, Lung, a...

Never sit more than an hour at the computer without getting up and moving around. Sitting for hours and not moving is a good cause for blood clots due to the bending of the legs for so long.

Any long period of immobility--such as being bedridden from illness, recovering from surgery, or sitting for extended periods while traveling--is a risk factor for DVT and pulmonary embolism, says the National Heart, Lung, and Blood Institute (NHLBI). DVT can also develop in other instances when the blood flow in the legs is restricted and slows down. Restricted flow may occur with certain types of cancer and cancer treatment, obesity, inherited clotting disorders, pregnancy, and damage to the veins following injury or orthopedic surgery.

Clotting the blood is "nature's way of trying to prevent bleeding," says Wolf Sapirstein, M.D., a cardiologist at the Food and Drug Administration. But when nature's protective mechanism overcompensates and precautions aren't taken, there is a danger of blood clots.

Chest pain can be a symptom of both heart attack and pulmonary embolism. Other common symptoms of pulmonary embolism are unexplained shortness of breath and coughing up blood. It's important to tell your doctor if you have taken a long trip recently, says Mohler, so you can be diagnosed correctly.

If you have any symptoms of pulmonary embolism, sit down and tell someone you have an emergency and need immediate help, says Stein. At that point, "there is no value in putting your feet up or drinking gallons of water. Getting to an emergency room quickly is your best shot."

Another potential complication of DVT is post-phlebitic syndrome, a permanent condition caused by valves in the leg veins that don't work properly. "The body has mechanisms within itself to dissolve clots, but it's a very slow process," says George Shashaty, M.D., an FDA hematologist. "In the interim, an inflammatory reaction occurs that can scar the veins, especially the valves." The valves then fail to prevent blood from flowing backwards, allowing the blood to pool in the leg veins and cause pain, swelling, and sometimes varicose veins and skin ulceration.

Facts About Deep Vein Thrombosis and Pulmonary Embolism
Nine out of 10 cases of pulmonary embolism are caused by blood clots that form in the legs and then travel to the lungs.
More than 600,000 people in the United States have a pulmonary embolism each year, and more than 10 percent of them die from it.
Most who die do so within 30 to 60 minutes after symptoms start.
Pulmonary embolism occurs equally in men and women.
The risk of having a pulmonary embolism doubles for each 10 years after age 60.

If you're marry or have a significant other, try sitting on his lap singing sweet nothings in its ear :-)

Get yourself a nice squishy swivel chair, and a timer! 20 mins. is as long as you should remain sitting at one time!

Turn off the glowing box, and get out of the house once in a while. Before you lose your eyesight too!

Get a lap top so you can lay on your bed like I do...