Preferably something that has nothing to do with computers or the Internet. Try a new activity or hobby. It would be even better if it could include your spouse, friend, or significant other. Don't give in the voice inside you that says you can't do it. There is probably no one single recommendation that I can make that can have as many positive implications for your life.
Exercise offers a variety of potential benefits.
There is considerable research on the efficacy of exercise in improving psychological well being along with improvement in treating addiction problems. This is what may produce the 'kick' or 'high' to behaviors such as gambling, compulsive eating, alcohol, or drugs. It seems plausible that Netheads' and Cybernuts' may be experiencing such chemical changes when on-line compulsively, although this is not fully understood. Before starting up any exercise program it is important that you consult your physician or healthcare practitioner. Watch less television.