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Chair-ball tips

Choose a ball that is big enough so that, when you’re sitting on it, your hips are at a 90-degree or slightly larger angle to your legs. The more rubbery the ball, the more durable and comfortable it will be. The top of your computer screen should be at eye level or 20 or 30 degrees below.

Place the keyboard close to your body so your elbows are at your sides and bent at a 90-degree angle.

Don’t throw away your office chair right away. You might have to work your way up to being able to use the ball for a full workday. Start using the ball for five to 10 minutes every hour until your core muscles get stronger.

Use common sense. Don’t sit next to a heating vent or anything else hot. Don’t sit on top of broken glass. Don’t sit near stairs or open landings.

Credit to: http://www.thestate.com/mld/thestate/sports/14652324.htm
SOURCE: “Working on the Ball: A Simple Guide to Office Fitness” (Andrews McMeel Publishing) by Jane Clapp and Sarah Robichaud