Computer Addicts’ Exercise Plan: Sitting, staring, and typing may no longer be enough to keep you in shape. Here’s a regimen to build those arms, shoulders and back muscles. While sitting at your computer, raise a 5-pound potato sack with each hand, extending your arms until they are straight out from your sides. Try to hold them there for at least 10 seconds. Relax. Drink coffee. Repeat. After a few weeks, move up to 10-pound potato sacks and eventually work your way up to 25-pound potato sacks in each hand for a full minute. Once you can do that with confidence, slip a potato into each sack, but be careful. Don’t overdo it!