It can be easy at times to throw yourself into supportive roles for several people at once. You can end up composing several long and heartfelt e-mail messages every day and find yourself taking on some of the burdens of these people. If you have the resources to spare, this can be okay, but too much of this sort of activity can lead to net.burnout, where you spend your days in a daze, emotionally drained and perhaps physically tired too through lack of sleep. This is similar to net.addiction, but in this case it is not the amount of time you spend on the Net, but the amount of effort you are putting into it. Interacting on the Net should never be a chore, it should be fun.
Physical activity is good, exercising slack muscles and getting the blood pumping.
Jog, play football, shoot hoops, dance, throw frisbees, build a birdhouse. Just remember that many Callahan's people will leap to provide comfort and assistance. If you already have a full or overloaded emotional plate to deal with, don't feel guilty about not accepting dessert. It may sound selfish, but if you end up burning yourself out then you won't be much of a help to anybody. This is a nasty topic, but it's better if you know about it.