Get yourself some fucking exercise! Look at yourself. Sitting there, eyes straining at an electric screen. Your body is being drained! What you need is a good work out of some kind. Here, from my personal experience, is my guide to the very very best of fitness programs...
SEX: There can be no doubt, sexual intercourse is the best exercise. Serious experts agree. It gives you an all over work out, your heart gets going, your lungs do their bit, you get a good sweat going. And best of all, it makes you feel great! Or if it doesn't, it should - get yourself a better lover. That is, perhaps, it's biggest drawback: the need for a partner, willing for an exchange of bodily fluids. They're out there, keep looking. Remember, sex is good for you.
Swimming: Less fun than sex, but gets you wetter. Swimming is the best of the rest, exercising your whole body neatly, and doing that cardiovascular thang as well. If you want it to be, it's calm, it's gentle, and yet it can be as frantic as you like. And best of all, you can go on holiday to your house on a Greek island, walk to the sea directly in front of the garden, and take the plunge. What's that you say? No house on a Greek island? Well I guess that some of us are just plain lucky, then.
Fencing: This is me, this is my sport. It makes me think of cats: periods of inactivity, then sudden and furious movement. It's just grand fighting with swords, and anyone can do it. Strength is immaterial. This is a sport where speed of body and speed of mind are the prerequisites. Great exercise, great fun. A thinking sport is definitely the one for me, and I'll bet you that it'll do you just fine as well. Why not give it a go as soon as possible?
Weights: When you get serious, hulk the bulk. If you're wanting to get fit aggressively, get yourself down to a gym, do some cardiovascular training, and pump some heavy metal. It's as hard as you want it to be (unlike so many other things in life) and you can build yourself a perfect physique if you have the will. Don't overdo it, though - you don't want to end up converting muscle to flab when you're older, do you? I thought not.
Actually that's it. I'm not that much of a team sports person, and most sports are for teams. Also I have this thing about balls flying at my head (yeah, yeah, we all know the joke) so I tend not to get involved in sports. But mental exercise, now that's another matter entirely...